Harriet Walker is a cop. She has it all, a loving husband and a promising career as a detective. But things go awry when her husband Matt, an undercover federal agent, is murdered. Within 24 hours, she has gone from detective to prime suspect and sets about burying her grief in her own private investigation. The painful search for details of her husband's death also leads to her confronting evidence of his infidelity. Together with new partner Joe, she must find her husband's lover to get to the truth behind the murder.

Harriet Walker is a cop. She has it all, a loving husband and a promising career as a detective. But things go awry when her husband Matt, an undercover federal agent, is murdered. Within 24 hours, she has gone from detective to prime suspect and sets about burying her grief in her own private investigation. The painful search for details of her husband's death also leads to her confronting evidence of his infidelity. Together with new partner Joe, she must find her husband's lover to get to the truth behind the murder.

Joe and Harriet head up the investigation of a young model's death after her naked body is found in a city dump. Harriet quickly runs afoul of the dead woman's parents who are resentful of the modelling industry which they blame for their daughter's death. Complicating matters is the involvement of two of the office's staff members with the investigation: photos of Nicole, a former model herself, appear in the portfolio of a photographer under suspicion, and Theo is seen on a surveillance video chatting up the young model in a club just hours before her death. On the home front, Joe is having reservations about having Nicole move in with him while Harriet revives a longstanding disagreement with her mother when she challenges her over her dislike of police officers.

The discovery of a blood-soaked four-year-old girl walking alone on the roadside leads detectives Hill and Walker to the scene of a bloody massacre that has left an entire family dead, save the young girl and her injured father. The investigation is particularly hard on Harriet as it takes her back to the recent murder of her husband Matt. To make matters worse, she has learned, second hand, that the DPP has consented to drop the murder charge against the woman accused of the crime in exchange for a guilty plead to the lesser charge of manslaughter. On the verge of a breakdown, Harriet must stay focused as she and her colleagues work to locate a killer.

The body of a popular local swimming coach is pulled from a pool and the Kingsway detectives are called upon to investigate the murder. The coach, Jimmy O'Sullivan, was a life-long friend of Ted Hudson and rumours of his possibly being a paedophile do not sit well with the Senior Sergeant. Theo offers his support to Sophie, who is feeling hard-done-by, however an intimate moment between the two is interrupted by her four-year-old son. Back at work, Theo is forced to reveal Sophie's secret to Hudson who, as she feared, quickly reassigns her to a sexual assault case before finally suggesting she stick to desk duty for the time being.

The pursuit of a stolen car ends tragically when a police officer is killed after an iron bar is thrown from an overpass, smashing through the car's windscreen and piercing the driver's chest. The officer, Albie Borich, is an estranged friend of Theo, who must break the news to Albie's wife, who is pregnant with what Theo believes could be his child. The investigation of the case is difficult for Theo who roughs up Lenny Hunter, a man suspected of being the driver of the stolen car. Police suspect the accident may have been an ambush, targeting the policeman responsible for arresting Lenny's brother, but is all what it seems?

An elderly man is found dead in his home. His body is bound to a chair, his home has been ransacked, and a mysterious hole has been dug in his backyard. The Kingsway detectives are called in. Further complicating matters is a mysterious phone call placed from the man's home to the Kingsway station on the day the incident occurred. Joe believes the call was from a careless police officer phoning in the crime, but the call appears in Nicole's phone log having been dismissed as just one of a series of prank calls made to the station in recent days. It's a puzzling case with few suspects and no apparent motive, the detectives have their work cut out for them. Nicole reaches her limit with Joe. His inability to appreciate the guilt she feels at possibly playing a role in the man's death (as a result of not acting on the phone call) sparks her decision to move out of Joe's house. A controversial court decision by Harriet's mother affects Harriet's relationship with Sophie.

A suspicious death on an Army base brings out Harriet and Joe to investigate. The death would appear to be a suicide but Joe is not sure, suspecting the military of closing ranks to protect one of their own.

High-stakes gambler Eddie Campbell is found dead at the foot of the stairs in his home, the apparent victim of a burglary gone wrong. Eddie had recently won a large amount of money at the track, leading detectives in the direction of his associates in the gambling world. Joe meanwhile, beginning to feel the loss of Nicole from his personal life, becomes involved with Eddie's attractive niece, the sole heir to Eddie's fortune. Eddie's girlfriend, a former working girl, tries to stake her claim to a portion of Eddie's wealth as police find her at his house packing up his silver. With Eddie's $100,000 in winnings still missing and a series of possible suspects, it is a recording of Eddie's last phone call that provides the clue to his killer's identity.

The body of Zoe Creek, a young waitress, is uncovered on the beach a short distance from where she worked. The woman's devoted fiancé tells detectives he suspected she was seeing someone else. His suspicions appear to be confirmed when it is discovered he is not the biological father of his fiancé's baby. With this revelation, attentions shift to real father, a married man who reluctantly reveals he had been approached by Zoe for financial assistance and met with her the night she was killed. Two troublesome young men enter into the mix as well. Joe is sure they're guilty of something but his heavy-handed approach results in little apart from a formal complaint being filed against Harriet. Theo presses Sophie for information about Eliot's father.

Theo and Nicole's evening out ends with an unexpected tragedy when Nicole is shot and rushed to hospital. With no reason for her to be the target of a contract-style shooting, the investigation is slow to develop. It is the discovery of a dead body at the bottom of a cliff that provides the crucial lead. The dead man, Lance Stiffner, was shot by the same type of gun that shot Nicole. It quickly becomes clear that Nicole was the victim of mistaken identity. The intended target was Nina Napolitano, who was having an affair with Stiffner. Her imprisoned husband found out and put out a hit on both her and Stiffner. The identity of the shooter is provided by a reluctant accomplice, and Joe and Theo are soon involved in a high-speed chase with their suspect. The chase ends when Joe draws his gun and shoots the suspect, believing to be in danger of being shot himself. However, upon searching the car, no gun is found. Was Joe mistaken or was it a case of cold-blooded revenge?

The police's Critical Response Team is brought in to investigate Lloyd Zuker's death. Theo lies about seeing Zuker with a gun to help Joe but his story doesn't hold up under scrutiny and lead investigator Frank Conti tries to get him to turn on Joe, threatening to charge Joe with murder and Theo with the attempt to pervert the course of justice. Despite the findings of Conti's report, Joe does have the Commissioner's support, but he's haunted by the shooting and is determined to find Zuker's missing gun and clear his name. Meanwhile, the detectives investigate the murder of a man whose body is pulled from a lake. Nicole comes out of surgery.

A body is washed ashore on a crowded beach. The detectives are quick to identify the dead man, an heir to a waste disposal fortune, as someone reported missing after reportedly falling off a yacht. The small number of people on board the yacht at the time of the accident means a limited number of suspects but leads the detectives into the investigation of the power struggles inside a divided family and the effects of violence. The investigation reminds Joe of his own troubled childhood and has him questioning his own parenting skills. Sophie and Theo compete for a spot in an undercover training course. Nicole, back at work part time, receives some good news.

A businessman is beaten to death on his morning jog. The man was newly arrived from Brisbane, coming down to oversee a corporate takeover of a marine salvage company. The small business is short on employees but long on people with motives: a secretary with claims of sexually harassment, an owner worried for his job, and someone responsible for embezzling thousands of dollars from the company.

A groom is shoot by a masked gunman at a lavish wedding reception, but despite all the guests, the detective's efforts are frustrated when no one will admit to seeing anything. Further complicating matters is an accusation that a police officer stole a large sum of money intended for the newlyweds — and evidence points towards Shane. Joe's receives an emotional blow when he learns his first wife has decided to move to Queensland to be with her new boyfriend, taking their daughter Ruby with her. To add to his woes, the seriousness of Nicole's relationship with Shane hits home when she tells him Shane has proposed. A friendly poker game yields a key clue in solving one of the crimes.

The investigation of a road rage incident leads to the discovery of an ecstasy importing racket. For Sophie, the focus quickly turns to her personal life when Eliot's father reenters her life, wanting the opportunity to be involved in his son's life. Seeking balance in her chaotic life, Sophie is tempted to let Dirk in but a shocking discovery puts much into doubt. Nicole is having second thoughts about her impending engagement to Shane.

A series of poisonings are linked to a local supermarket chain. Products at the store are being tampered with and demands have been made by an extortionist. The detectives' efforts to solve the case are hampered by the store's management who hope to keep the story out of the media, but it soon becomes too much for Joe who goes to the press to warn the public. Nicole rejoins her colleagues at Kingsway as Constable Brown.

A beach party goes terribly wrong when a teenage girl is found dead on the beach the following morning. Joe's life is once again thrown into turmoil when his father, absent from his life for the last twenty years, shows up on his doorstep wanting to reconnect with his family.

The body of a newborn baby is unearthed in a churchyard after a priest reluctantly comes forward with information given to him in confession about a possible body buried in the local presbytery. When the priest is later found hanged in his office, the detectives' initial thoughts are suicide, but why would a priest commit a mortal sin by taking his own life? Could the two deaths be related? Meanwhile, Joe's new girlfriend, Harriet's best friend, pressures him to tell Harriet about their relationship.

A star soccer player is murdered in an apparent robbery attempt on the club's offices. The slowly developing investigation upsets Hudson and nearly costs Theo his life when a surveillance job goes wrong. Joe's relationship with Kaz suffers a serious setback when his family responsibilities clash with her desire for a good time.

The skeletal remains of a missing teenage girl are discovered in the national park following a controlled burn, leading detectives into a series of fifteen-year-old missing persons cases. The investigation takes on a personal note for Hudson who is still haunted by the unsolved disappearance and presumed murder of another young girl. Information from a woman who was herself an attempted abductee leads to a suspect who is now dead, forcing Hudson to turns his attentions to the man's former girlfriend. Hudson is determined to get the woman to talk, but how far will the by-the-book sergeant go to get a confession?

A frantic early morning visit by an old friend of Harriet's may be an omen of an investigation not yet begun when he later comes forward to police to report having been in the company of a woman the night she was killed. The detectives are torn between two suspects. Joe believes Harriet's friend being unable to recall events of the night in question makes him an obvious suspect while Harriet looks at the woman's fiancé as the more likely suspect.

When a Kingsway bank is robbed over the weekend, the detectives' suspicions fall on the bank's manager who is nowhere to be found. Fran's arrest for impaired driving exposes troubles in her personal life.

The Kingsway detectives investigate the brutal murder of a Filipino woman. They suspect the involvement of the woman's husband and possibly one or both of his parents but all parties have alibis and no one is prepared to talk. Sophie informs Hudson about her relationship with Theo.©

The death of a fruiterer seems the result of a war between two organised crime gangs. Or is it just personal? Could Harriet be suffering from a case of the green-eyed monster? She certainly seems anything but chuffed when rookie constable Nicole Brown moves in on the close professional bond Harriet has formed with Joe Hill. Nicole was once involved in a steamy relationship with Joe. Now Harriet can't help feeling that her professional territory is being invaded.

A complaint filed against Hudson by an ex-con who accuses him of fabricating evidence places his career on the line when he loses the Commissioner's confidence. Joe's unwavering support for Hudson only makes the situation worse when, with no evidence, he questions Hudson's accuser in relation to a recent armed robbery. Hudson is forced to take the blame for the incident to keep Joe in the clear but in doing so gets suspended. Loyalties at Kingsway are divided as Joe continues his pursuit to clear Hudson but Harriet warns him it may not be possible. Joe's father returns but Joe is no more sympathetic than the last time he appeared.

A security guard is murdered during a break and enter at the fortress-like home of a wealthy banker. The only forensic evidence is a child's tooth discovered near his body, but could a child be capable of such a horrific crime? Joe's father, in failing health, has resurfaced in his life hoping for a reconciliation.

An older couple appear to be attempting to import heroin into the country when the drug is found concealed in their Thai holiday souvenirs. Are they just innocent carriers are were they trying to finance their retirement through drug smuggling? Theo is stabbed repeatedly with a syringe during a scuffle with two druggies in a car park. He wants to keep the incident under wraps but doing so requires him to distance himself from Sophie.

The Kingsway detectives are drawn into the medical world when an anaesthetist is found dead in a hospital car park. Was it a random attack or could malpractice have had something to do with it? Investigations soon reveal that the murder victim had many skeletons in her closet. But so too, it seems, do several of the other doctors and patients at the hospital where she worked. Meanwhile, having sworn Harriet to secrecy about being stabbed with a needle by a junkie, Theo is furious when she breaks his confidence.

When Nicole is called to the horrific murder of a young woman in a remote industrial area, she's forced to examine the way she views crime and criminals. Forensic tests reveal Diane Swift was raped, tortured, and set on fire with petrol. The horror of the murder leads Nicole into a relationship with the woman's best friend as she strives to understand the reasons behind the killing. Nicole's empathy deepens when she's asked to imitate Diane for a re-enactment of her last known movements in an attempt to generate badly needed leads.

Three elderly women are brutally murdered in their homes forcing the Kingsway detectives to determine if the crimes are the work of a serial killer or merely coincidence. Nicole calls on Sophie's estranged mother to help care for Eliot. Theo's test results come back.

The body of a young Asian girl is found in a garbage compactor, leading the Kingsway detectives to an international illegal prostitution racket.

The lives of two of Kingsway's finest detectives are in grave danger when Joe and Harriet are the targets of a terrifying car bomb attack outside the police station. While Harriet survives the blast, two uniformed policemen are seriously wounded. And things are about to get much worse for the crime-fighting duo as they continue their investigatation into the sex slave racket. Joe is devastated when an anonymous complaint is made against him, hinting at sexual misconduct with his daughters.