When Mannion has Temple and Debreno investigate the woman's murder, he discovers that the criminals weren't going for the victim's cash or credit cards, but for the expensive purse itself. In response, Mannion immediately dispatches detectives to patrol subway cars, angering the chief of the Transit Authority, who believes that Mannion is trying to muscle in on his territory. Then, when Debreno and Temple set up a sting operation, Debreno's life is put in danger and Mannion's team must find a way to draw out the perpetrators of these crimes before they strike again. Also, Mannion's outrageous ex-fiancee comes back for a visit after hearing that Mannion and Sherry split up.

Mannion issues a mandate to get illegal guns off the streets and uncovers the surprising motive behind the murder of a well-connected young man.

People in the witness protection program become victims, and the team sets out on the case to find the killer. Meanwhile, Chief Mannion gets a specialty sandwich named after him, which then becomes ""hard to swallow.""

Detective Travis Haywood is shot while performing an undercover operation by an off-duty cop. Mannion has to handle the manipulative press that keeps referring to the incident as the third time a black cop has been shot by a white cop. Detective Heywood dies and the issue of prejudice gets stronger as the black cops demand the shooter to be severely punished.

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A woman who was driving home late at night is found beaten and raped after being stopped by a police officer for a traffic violation. After talking to the woman, Mannion discovers that this is the latest in a series of attacks allegedly perpetrated by a police officer. Now, after Mannion conducts an internal investigation of his officers and fingers start pointing at Cutter, Debreno is thrown for a loop when his estranged wife (Farentino) informs him that she was attacked in the same exact way. Meanwhile, Preston Kembridge, a mayoral candidate, tempts Nick with an offer to run his campaign. (from CBS)

After a women is stabbed to death outside her apartment building, and no witnesses are willing to speak to the police, Mannion moves in, hoping to gain the residents' trust. The housing project has been a dangerous place to live for a long time and the residents are weary of the police, who never seem to be there when they need them. Now, Mannion must convince them that this is not a media stunt -- he honestly wants to make their lives safer -- and that they need to speak up before the killer strikes again. (from CBS)

A teacher, protesting the Board of Education's inattention to her cries, takes the board hostage at gunpoint and Mannion is called in to diffuse the situation. Frustrated by getting the run-around from the board and environmental agencies, she gives Mannion 12 hours to find answers to the teacher's and students' health problems before she opens fire. Mannion and his team must uncover a complex environmental cover-up while keeping the board and the teacher alive. Meanwhile, Ella asks Clive, the new man she is seeing and a lobbyist for the chemical industry, to look into the case from his end.

Ella is fearful of what will happen to Ricky when he testifies against his father, who's on trial for murdering the boy's mother; Temple tries to convince the victim of a serial rapist to testify; Nick discovers some explosive evidence against the mayor.

When two children are shot by a 7-year-old boy, Mannion makes it his mission to find exactly how the boy got his hands on a gun. When Mannion questions the 7-year-old, he learns that the youngster took the gun from his 15-year-old brother who reveals that he got the gun from a ""guy on the street"" near his school. With the help of Temple and Debreno, Mannion sets up a sting and discovers that the weapon was actually a gun that the police had confiscated in a ""buy-back"" program. Now, with the Public Safety Commission breathing down Mannion's neck, he must track down the culprits before any more guns hit the street or any more children get hurt.

After Nancy discovers a murdered homeless man, Mannion notices that the body has a distinct military tattoo. He identifies the man as a former Marine believed to have been held prisoner in a Vietnamese camp. They soon learn that the victim may have been one of many POW's who were returned to the United States in the 1980s after the government stated that there were no prisoners left in Vietnam. Now, as Mannion delves further into the case, he must battle the demons that continue to haunt him from the time he spent in Vietnam. (from CBS)

Mannion searches for a modern day Robin Hood after he distributes money and stolen goods from the roof of his own building to needy neighbors on the street. Meanwhile, Temple continues to deal with the shooting of Lester Richards.

Mannion gets involved in a local murder investigation when he travels to a small town to fight a warrant for his arrest for a traffic violation. Meanwhile Temple and Debreno look into the disappearance of an armored truck owned by the company the Temple works for part time.

Mannion searches for a vigilante who is killing convicted child molesters; Ella learns that one of her neighbors is a former sex offender.

Mannion decides to declare war against street gangs after a drive by shooting kills an innocent pedestrian. Two Latino gangs (the ""Colombian Guardian Crew"" - C.G.C. - and ""Los Muertos"") - one Cuban and one Salvadorian - are in war with each other over territory limits and Mannion sends his best men to catch the main leader accused of killing the pedestrian: Carlos ""El Gato"" Cesar, one of the most dangerous gang members in the city. Meanwhile, Mannion has suspicions that the same man that reported a criminal fire is the one who started it; and Nick has to face his fears after being badly beaten up by a robber.

Mannion confronts his No. 1 enemy, Dimitri Putin, and learns who killed Det. Danny McGregor in this pivotal episode. A Russian woman, Erin Vratalov, comes aboard Mannion's boat claiming she needs protection from Putin. She tells Mannion that Putin ordered her husband, Yuri, to kill the chief. But when Danny died in the assassination attempt instead, Putin had Yuri murdered and is now after her. She also claims Yuri had a tape recording of Putin giving the order to murder Mannion, but she doesn't know where it's hidden. So begins Mannion's race to find the incriminating evidence, a search that leads ultimately to a volatile face-to-face encounter. (CBS)

When a man is murdered under suspicious circumstances and Mannion finds out his office is bugged, he starts his own investigation on the case. The latest person to see the victim alive was Lisa Fabrizzi, a CIA agent, which connects the case to the Agency. Mannion faces CIA director Tom Gage for information but doesn't get anything except for a stonewall. Mannion finally gets to the real killer, Braxton, who worked at a software company involved in CIA covert operations. Braxton is killed. Meanwhile, Ella almost buys the house of her dreams and Parras and Brander have to protect condo residents from a monkey.

When father Patrick Debreno is shot at a funeral, Mannion and his team start an investigation to discover who the shooter is. They search through Monsignor Banning (father Debreno's mentor) past and discover accusations against him on sexual abuse against a child. Suspecting that father Debreno was not the target, Mannion reopens the case and the mother of a molested child gives herself in. Meanwhile, Ella struggles to balance her time between work and Clive, while the characters reflect on their faith during the course of the episode.

A doctor who was reporting a crime sees Brander bring in a foreign criminal with a very suspicious disease, which she thinks might be Ebola. Instantly the office is put in quarantine. Without being able to get out, Mannion has to count on Ella, who was at home preparing for her wedding to keep the order while he breaks through Brander's isolation bubble to save his life. Meanwhile, Debreno drives in the snow to find a delirious Temple, who was exposed to the bacteria and might be contaminated with what was later discovered to be a harmless African flu. The next day they all attend Ella's wedding, where Ricky calls her 'mom' for the first time.

While in L.A. Mannion unexpectedly meets up with Vanessa Cavanaugh and offers her a ride. Unfortunately the rental care is carjacked and the pair find themselves stranded in a deserted part of town after they get carjacked. Back in Washington, Deputy Mayor Lockhart asks Debreno to help her find a blackmailer who has a scandalous videotape that could destroy her career; Kendall is threatened by her ex-boyfriend; and Ella is offered a job by the mayor.

Mannion investigates of the murder of a young illegal immigrant leads to the discovery of a car theft ring run by a teenage gang that is selling cars as far away as El Salvador.

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

An operation to catch a theft mob is set and Temple goes undercover as a pawn shop salesman who also works selling stolen objects. After entering a scheme for stolen credit cards and laptops, the agents make the arrest for the two brothers who were the heads of the gang. Meanwhile, McGregor investigates the origins of a stolen bracelet caught on Temple's pawn shop, which leads to a case of rape/murder from five years ago. McGregor is convinced the prime suspect is the murderer, but can't make an arrest until he tries to fly outside the country. Nick is still trying to develop a good relationship with the community member, but can't because she won't date white men. Nick tries to make something to please her and stops a demolition in the name of Mannion, who wasn't pleased to hear that and ends up giving Nick a warning about mixing personal life with work. And Queenie, the presidential dog, runs away and a psychic is called to help find her.

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