Mannion goes after a dealer who is supplying drugs to rich executives. Meanwhile, his ex-wife, Sherry, shows up unexpectedly to deliver bad news.

Just as Mannion and his ex-wife, Sherry, are making plans to get back together, their son, Jack Jr., arrives for a visit. He brings his new girlfriend with him and they announce they're taking a year off college to travel through Europe. The problems grow bigger when Jack Jr. is confronted by his dad for using ecstasy and is later arrested at a rave party for possession and traffic. Meanwhile, a kidnapped woman calls from a car's trunk begging for help before she is killed; Nick has to face neighborhood problems at his new house and Parras is confronted and suspended by her superiors after her gun is stolen by a man she picked up at a bar and used to kill a man.

Two ex-cops who worked as bank securities are shot to death and Mannion suspects that the Russian mob is behind it. The FBI wants the case, but Mannion won't let go and decides to solve it by himself. He contacts Monya, a Russian gangster from NY with whom he has a history and Monya gives him a name to go after. The FBI wants to take over the investigation and Mannion refuses to help them given the issues he has with the bureau back from when they let his old partner die. After a few insults that cross the line of internal rivalship, compromising evidence from Jack's personal account appear to incriminate him, possibly planted by the federals.

Meanwhile, Temple's marriage is approaching and he couldn't be happier. But his plans are suddenly interrupted when he pays his fiancée a visit at the hospital. Two men had just arrived from a neighbor fight over a fence, and one of the victim's brother goes insane and tries to shoot the other man. But McGregor throws himself to protect the man a

Mannion receives Monya's hand by the mail, an indication that someone is plotting against him. Temple hasn't recovered from his fiancée's death, but Mannion accepts him back on the force. With Mannion under heavy investigation, the mayor has no options but suspend him. Noland steps in as police chief. Noland assigns McGregor and Temple to work directly for Mannion and he decides to run a investigation of his own. Temple, McGregor and Mannion go to a contruction to investigate the Russian mob, since a scheme for money laudry in the value of over 1 billion is discovered. The FBI tapes two unidentified Russians talking about Mannion's murder, and the voices are identified to be Boris' (Mannion's informer) and Putin's (the man the FBI is after). McGregor and Temple see four suspects enter Boris's bar and call Mannion. Temple decides to take action and walks into the bar, despite Jack's order to wait for him. Temple starts a fight with the men, resulting in him being taken hostage by one of

Mannion decides to take every missing case as a homicide case after a rich woman is reported missing, which causes some problems among the African-American community. Debreno is introduced as Temple's new partner, who is still recovering from his fiancée and his ex-partner's death. Ella is back at work, still recovering from breast cancer. Nancy considers going back to the streets as she recovers from Danny's death. Mannion investigates the main suspect on Danny's murder, and finds the suspect's apartment full of pictures of him, Sherry and his children. Sherry leaves and an anonymous call leads Jack to discover the suspect's body tied on his boat's anchor.

Page and Debreno investigate the murder of a reporter, and evidence point them to a wheel-chaired man, who claims the victim was already dead by the time he found her. Mannion goes to NY for his daughter's graduation from police academy and has a hard time saying goodbye to Sherri. Meanwhile, Parras meets a charming man on a cab and thinks he might be ""the one"", and Brander confesses his love for her. Ella goes to Ricky's school to check on why he is having problems with his new teacher, and finds out she looks just like his late mother.

Without a job and his best friend, Jack takes off to Arizona to play some golf, but not even without his badge he can stop solving crimes. He gets himself involved in a scheme of dirty cops with Mexican dealers and crosses the border to catch the dealer – which he does. Meanwhile, back in D.C., Cavanaugh and Sherry team up to trace Jack and Cavanaugh discovers something that might save Jack's job. Nancy does some investigation on her own and discovers that the guy that died on Brander's hand was injured prior to their encounter, which could clear Brander. Temple and Debreno set up a scheme with Cashmere Brown to bust Lester Richards, who ends up shot to death by Temple.

Mannion is determined to have the best people possible working for him and asks his ex-wife, Sherry, to become his Superintendent of Detectives. Meanwhile, when an ex-con is arrested for the murder of his girlfriend who was also a parolee, Mannion tries to put into action a parolee-rehabilitation program Ella had begun before she died.

Chief Mannion and his men investigate the disappearance of teenage girls who all point to a virtual suspect: a guy named Icarus who uses the internet to lure his victims and eventually murders them. The case takes a personal turn when Noland's niece becomes the next target and Joe puts all his efforts into catching the guy. Meanwhile, Temple suffers with pranks and rash commentaries from his co-workers about the death of Lester Richards, while Sherry tries to adjust to her new job.

Mannion investigates the death of a man during a Civil War reenactment. While Temple takes the matter personally when one of the suspects turns out to be a big time racist, it's Noland who, trying to find a connection between him and a man in an old picture, discovers a rivalry between the prime suspect and the victim that dates back to the Civil War days. Meanwhile, Debreno and Regan are out testing a new bait car that almost causes the death of a car thief.

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Mannion investigates the murder of two young women, one of whom is identified as Debreno's sometime girlfriend, Maria.