The detectives investigate a multiple homicide at a fast food restaurant; an addict gives his baby daughter to a drug dealer as collateral on an overdue loan; Internal Affairs reopens the Kirkendall case.
Fancy is being sent on a training course ahead of the squad getting computers. A woman is attacked by a court jester in a hotel room, then a body is found in another room - are they connected? Diane questions her involvement with Danny.
A man loses his penis. Fancy makes Captain and the incoming Lieutenant is a ball-breaker. Andy is having second thoughts about Cynthia. A mob hit-man sings like a canary and implicates a celebrated Customs officer.
Rodriguez mediates when Sipowicz and Sorenson clash with detectives from another squad anxious to solve a multiple murder case; Medavoy and Jones try their hand at making extra cash by cleaning up murder scenes.
Sipowicz and Sorenson investigate a case involving an off-duty police officer who was shot in the company of a prostitute; Medavoy and Jones aid a hapless bodega owner by concocting a story to keep him out of jail.
Sipowicz is hailed a hero after killing the man responsible for Sorenson's murder. While Lieutenant Rodriguez teams up with another precinct to investigate the robbery of his mother, the squad investigates the murder of two men affiliated with NYU.
The squad investigates two homicides: the immolation of a would-be musician and the stabbing of a socialite. The newest detective to the squad, John Clark, Jr., attempts to both learn a new job and fit into the squad despite interference from his father.
The squad is joined by Eddie Gibson who's been transferred from nightwatch. McDowell and Gibson investigate the murder of a woman with MS, while the other detectives investigate the killing of a Rikers corrections officer.
When Clark's badge is stolen, the squad scrambles to find the thief before Clark must report the loss, which could ruin his career. McDowell and Gibson investigate a murder involving a young pregnant girl.
The squad investigates the murder of two drug dealers, and the discovery of a body mistakenly listed as a victim of the World Trade Center attack. McDowell arrests the daughter she gave up for adoption.