Brenda and Fritz have a hard time agreeing who is in charge when an informant's wife and and FBI agent are both murdered. Brenda discovers that she and the PHD must work quickly when the leading witness in the case is scheduled to testify against a powerful mobster. When the killer's identity is uncovered, the PHD finds themselves under attack; an attack that takes someone down.

When a massive fire breaks out in Griffith Park, Priority Homicide is on hand to help. But when an unidentified dead woman's body is found in the center of the scene, Deputy Chief Johnson is doing a lot more investigating then directing traffic. Meanwhile, Brenda and Fritz are living in a small apartment and getting on each other's nerves.

Brenda suspects something more than suicide when a high-school girl is found hanged in her bedroom; the investigation uncovers a ruthless sexual game being played at a private school.

A man wearing a surveillance wire is shot to death at point blank range in downtown Los Angeles; interpersonal relationships on the squad force Brenda into a corner.

When a 12-year-old disappears, Brenda must decide whether to treat him as a runaway or a missing person.

Det. Julio Sanchez' little brother Oscar is shot and killed, leaving Julio beside himself with grief and seeking his killer any way he can, which threatens the investigation.

Brenda and the squad investigate the murder of a hair stylist; Brenda's parents stop in for a visit on their way to Alaska; Brenda's father wants to know when she and Fritz are going to tie the knot.

An FBI informant is the prime suspect in the deaths of two Tijuana police officers; Pope, Taylor and Brenda must deal with a public relations mess when a newspaper prints an unflattering story about Priority Homicide.

The newly renamed Major Crimes Division investigates the death of a teenager that may be related to a planned massacre; the squad searches for a bomb before it can explode.

Brenda goes toe to toe with the tricky attorney of a man suspected of a brutal rape and murder. Going a few rounds to get to the truth, Brenda dukes it out with the lawyer who is just as clever in the ring as she is. Can she hang in there and get to the truth before the final bell?

Brenda and Fritz's attention is diverted by problems on the job even though their wedding day has finally arrived, and bad blood between the members of the Priority Homicide Division threatens to cause one of the officers to leave the department.

While investigating the homicide of an entire family, the team once again finds themselves entangled in an FBI case. They also find themselves distracted by an unusually surly Provenza.

Brenda and the team are called in to investigate the questionable disappearance of a shady financial investor. The team is a mess with Daniels now in another division, Gabriel doing double duty, and Provenza with behavior more curious than usual. In the meantime, Brenda and Fritz deal with a sick Kitty.

Sgt. Gabriel comes under investigation for shooting a homicide suspect when the facts don't add up. The internal investigation gets in the way of the original murder investigation, leaving the entire team tied up in knots.

Once again working with Fritz and the FBI, the team helps get to the bottom of a murder which occurred amidst a drug ring investigation. Also again, Brenda finds FBI feathers ruffled by her unorthodox methods.

When a reformed gang member is murdered, the case takes the team back to a familiar neighborhood where they find themselves unwelcomed. Brenda must figure out a way to solve what appears to have been a missed-mark murder and bring peace to an unstable community.

When an internet matchmaker is murdered, the team finds themselves investigating the matchmaker's early-stage television show. Adding to the craziness is a fake officer, who turns everything upside down. In an effort to school himself on the inner workings of Brenda's group, Pope decides to work as one of the team.

While investigating a suspicious suicide, the squad wades into a nasty child-custody dispute between a dying man and his meth-addicted ex-wife. Meanwhile, Pope applies for the police chief job, but Brenda might have something to say about whether or not he gets it.

Provenza once again finds himself in a professionally embarrassing situation when he discovers a dead body in the condo of a flight attendant he picked up while extraditing a prisoner.

At the request of Detective Mikki Mendoza, the squad becomes involved in investigating a series of brutal murders that indicate a Mexican drug cartel may have moved into the city.

After a parole board member is viciously murdered during a panicked phone call with Sgt. Gabriel, Pope announces an overreaching plan to boost the police department’s image. His plan, however, hinges on Brenda first being able to solve the crime.

A bank robbery supposedly committed by a known gang of thieves leaves a security guard dead. It also leaves a lot of unanswered questions about the prime suspects and why this latest robbery doesn't fit their regular pattern. Meanwhile, Pope gets some news about his chances at becoming the city's police chief.

In a case that could carry national security implications, three soldiers are gunned down outside an LA club two days after returning home from duty in Afghanistan. Brenda’s investigation puts her on a collision course with Major Edward Dorset (guest star Gary Cole), a military liaison officer.

The murder of two paramedics leads the LAPD and the FBI on separate investigations on a case that could be the precursor to a major terrorist attack. But Brenda fights to remain a step ahead, even though she's forced to work with the counter-terrorism unit's Chief Tommy Delk, who happens to be one of Brenda's fellow finalists for the job of Chief of Police.