The District

Mannion decides to take every missing case as a homicide case after a rich woman is reported missing, which causes some problems in the African-American community. Debreno is introduced as Temple's new partner, who is still recovering from the deaths of his fiance and his ex-partner. 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 in 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 to his boat's anchor.

Mannion has to handle an international crisis after the son of the Colombian ambassador is discovered to be the primary dealer of the heaviest type of heroine yet. Threatened not to do anything about it, Mannion studies the international code for diplomatic immunity and plays around until he gets Eduardo kicked out of school and arrested. Meanwhile, Temple helps a heroin-addicted woman; Ella has problems with Ricky after he returns from summer camp; Jack Jr. goes to court for his drug problem; and Nancy finds Jack a new assistant.

Temple and Debreno are working on a carjacking followed by a murder case. Parras is suspicious when the victim's fiance cries, but no tears come from her eyes. The case is only solved with the help of a schizophrenic homeless man with multiple identities, who saw the suspect with another man just before the shooting. Temple and Debreno are not getting along, and Mannion has to interfere before Temple (who's much more religious since his fiancee's death, which annoys Debreno) tries to quit. Ella has to handle a strike/budget crisis. Parras is back on the streets, and her partner takes it hard when another black man insults him. A snake is left loose around the office.

After a woman 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 wary 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.

A construction worker finds the skeleton of a dead boy. He was Noland's last case before being promoted - a case that was never solved. Now Noland devotes all his efforts to putting an end to this crime. They finally arrest the boy's mother, who also killed another son of hers. Meanwhile, Mannion tries to change the child abuse scenario in the city. Nick negotiates a possible candidature of Mannion's for the upcoming mayor election. Ella has to fire an old employee but manages to keep him. Parras has trouble dealing with an abusive father that reminds her of her own father until proven that this father never touched his problematic 14-year-old son.

When a 7-year-old boy shoots two children, 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 the youngster took the weapon from his 15-year-old brother, who reveals 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 a gun that the police had confiscated in a "buy-back" program. With the Public Safety Commission breathing down Mannion's neck, he must track down the culprits before any more guns hit the street or 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 POWs returned to the United States in the 1980s after the government stated that there were no prisoners left in Vietnam. As Mannion delves further into the case, he must battle the demons that continue to haunt him from his time in Vietnam. 

When Mannion has Temple and Debreno investigate a woman's murder after she's thrown in front of a bus, 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.

A woman driving home late at night is beaten and raped after being stopped by a police officer for a traffic violation. After talking to the woman, Mannion discovers 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 informs him that she was attacked in the same way. Meanwhile, Preston Kembridge, a mayoral candidate, tempts Nick with an offer to run his campaign.

When police officer Robert Turner woke up one Thursday morning, he thought it would be just a normal day on the force. However, when a car plunged off a bridge into a river, Turner lost his life rescuing the family inside. Now, Mannion and his team reflect on the life and death of one of their own.

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. Nancy seeks help in her ex-lover's murder investigation.

After the vandalization of a mosque, Mannion questions the mosque president, who reveals that the mosque has been receiving threats. Meanwhile, Temple and Debreno investigate two other hate crimes - both with similar scenarios - involving a rabbi and an African-American, respectively. Now, before racial and ethnic tensions escalate, Mannion and his team must get to the bottom of these crimes - unaware that the perpetrator is the last person they would suspect. 

Page and Debreno investigate the murder of a reporter discovered in an abandoned building. Evidence points them to a man who uses a wheelchair and claims the victim was already dead when he found her. Mannion goes to NY for his daughter's graduation from the police academy and has difficulty saying goodbye to Sherri. Ella goes to Ricky's school to check why he has problems with his new teacher and finds out she looks just like his late mother. Meanwhile, Parras meets a charming man in a cab and thinks he might be "the one," while Brander confesses his love for her.
 

A teacher, protesting the Board of Education's inattention to her cries, takes the board hostage at gunpoint, and Mannion must 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.

Mannion faces Putin once again, and the stakes are even higher when Putin resurfaces and kidnaps Mannion's daughter! Mannion's initial theory is that Putin wants to trade one daughter for another. But everything changes when the CIA informs Mannion that Putin's daughter, Erin, has disappeared from the Witness Protection Program. Mannion finally finds his dazed and confused daughter, Beth; however, things get more complex when the police find a dead woman, believed to be Erin, in Beth's car trunk. When Beth is arrested for murder, Mannion must prove that his daughter was framed. The only person who can help him is Putin. Also, Mannion and Parras remember Mcgregor one year after his death.

Mannion's friend and restaurateur Teddy Reed is the only witness to a Congressman's murder, and Mannion suspects she's lying about the whole situation. Meanwhile, the city erects a statue depicting a heroic act by three police officers, including Cutter. But many are infuriated when Cutter's figure is altered to represent someone of a different race.

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 last person to see the victim alive was Lisa Fabrizzi, a CIA agent. With the case connected 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 works at a software company involved in CIA covert operations. Then, Braxton is killed. Meanwhile, Ella almost buys the house of her dreams, and Parras and Brander have to protect condo residents from a monkey.

Thirteen years ago, a man was convicted for murdering two people at a convenience store. Now Patrick Debreno, Kevin Debreno's brother who's a priest, has to help save him from the death penalty. Someone confessed to him the location of the murder weapon, and Chief Mannion and his team get the suspect and try to make him confess since Patrick can't accuse him. Unfortunately, Gilbert Isaacs is wrongfully killed for a crime he did not commit. The actual murderer, however, storms out of the interrogation room and shoots himself at home. 

Meanwhile, Ella receives a letter from Pablito, Ricky's father. He's asking to see his son, and after a lot of thinking, Ella meets with him and decides not to let Ricky see his father. She still has to convince Ricky that his father being in prison is not his fault.

When one of Debreno's first cases solved under Mannion goes to trial, the defense uses Debreno's troubled professional and personal past to discredit him, implying that he set up the defendant to impress Mannion. Now, as Mannion questions Debreno's motives, he must also decide whether or not Debreno has a future as a part of his team.

The gangster wars have crossed the limits, leaving a bloody trail and numerous victims. Mannion has Temple working undercovered, trying to reach the big boss on the drug dealing schemes. But it's not such an easy road, forcing Temple to try some crack to prove he's not a cop. That brings back ghosts from his druggie past, which Temple may not be strong enough to fight again. Meanwhile, Mannion himself interferes with the gangsters, interrogating young 12-year-old Junior about homicides. Later, Parras and Brander are victims of an ambush and kidnapped by the gangsters. Luckily the police force rescues them before anything happens. Mannion sees no way out but to turn to Richard Gray for help. With him, he gets the gang leaders to settle a non-aggression deal. When everything seems to be going back to its place, Temple looks for drug dealers to buy some crack. Ella turns down Clive's proposal to move to Seattle with him, and he decides to stay and marry her. And Mannion's life is threatened.