The mayor suspends Mannion as the FBI continues to investigate the Chief's ties to Russian mafia. In the meantime, Temple comes back to work too early after his fiancée's murder -- endangering himself and several other officers -- and Ella goes through a mastectomy. 

The FBI investigates Mannion after he makes contact with an old informant from the Russian mafia about a bank robbery where two ex-cops were killed. Meanwhile, Temple's fiancée is shot during an attack in the hospital and Ella discovers her cancer has returned.

While undercover in a fencing operation, Temple attempts to catch criminals on tape bringing in stolen property. In other events, Mannion helps a psychic find the President's runaway dog and Nick gets in trouble for using Mannion's name to keep an old firehouse from being torn down.

When a white officer shoots a black undercover officer, Mannion deals with racial tension within the force.

Mannion discovers that his girlfriend is supplying his son with an illegal drug, while Nancy is forced to admit that she had a one night stand with a stranger after her gun is stolen.

Mannion attempts to take down the leader of a vicious gang who shot a rival and make a suspected arsonist confess to setting a fire in a nearby park. Meanwhile, Nick is robbed and assaulted in his home and 911 operators threaten to quit unless their demands are met.

A Vietnamese businessman and former colonel is suspected of running a sex slave operation using kidnapped Asian girls, one of whom is found dead. In other events, Ricky won't tell Ella why he doesn't want to go to school and a confrontation ensues when McGregor is reluctant to acknowledge his relationship with Nancy.

Mannion goes to New York for his ex-wife's wedding, while an ex-cop accuses Noland of covering up a case from 30 years ago involving a politician's son.

Mannion promises to give cabbies better protection when a cab driver shoots a passenger he thought tried to rob him. Meanwhile, a new U.S. Attorney proves to be controversial and McGregor is jealous of Nancy getting flowers from a secret admirer.

Mannion tries to reunite a boy with his imprisoned mother. In other events, McGregor attempts to protect a woman from her stalker, a female reporter follows Mannion to write his profile and Temple has doubts about his forthcoming wedding.

Mannion calls in an undercover cop to put a stop to the vigilante murders of child molesters, while Ella discovers that a neighbor is a former sex offender.

Mannion gets personally involved in the case of a missing husband, while McGregor threatens a former IRA gunman in D.C. for peace talks.

Temple isn't sure he can lead an investigation to catch a serial killer strangling prostitutes after seeing the victims' bodies. Meanwhile, Mannion is pressured to hire a politically correct candidate as district commander.

Two groups of Santas fight over the best corners for charity. In the meantime, Mannion is threatened by an anonymous phone caller claiming to have been mistreated in the past, a truck of Christmas merchandise is stolen and a high-ranking senator is arrested for drinking and driving.

Mannion goes after a dealer supplying drugs to rich executives, while his ex-wife shows up with some bad news.

A criminal is stalking elderly people, emptying their bank accounts and murdering them. In other events, the mayor comes clean about his past and Ella isn't sure whether to accept a date offer.

Ricky's father goes on trial for killing the boy's mother, Temple tries to talk a victim into testifying against a serial rapist and Nick discovers shocking evidence against the mayor.

Mannion disciplines several officers caught stealing on the job who are needed for riot control when Fidel Castro visits D.C. along with a Cuban general who killed exiles in a bombing. Meanwhile, Ella's custody case comes to an end.

The police are ordered by the FBI to participate in a rehearsal for a possible terrorist attack. In other events, a teen goes on a killing spree after escaping a detention facility, Ella fears losing Ricky in a custody hearing and Nick goes on a date with Helen.

Mannion angers veteran officers when he shifts their day shifts to evening in order to reduce crime. In the meantime, McGregor thinks the chief is investigating him and Ella is challenged for custody of Ricky.

Mannion attempts to clean up the most crime infested block in D.C., while Temple is accused of pushing a drug dealer in front of a car and a woman claims to be Ricky's aunt, to Ella's shock.

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.

Jack Mannion becomes the new chief of police in Washington, D.C., but he's met with hostility by Joe Noland, who feels more deserving of the promotion.