Season 4

Lt. Barker recruits JC and Moreno to get the armored-car robber who killed Eddie and MacNamara.

Members of the unit target a modeling agent.

Agents interfere in an undercover operation aimed at a Colombian drug kingpin.

Missing teens prompt a probe of a private hospital's organ-donor program.

The detectives go undercover on Wall Street to foil a stock-manipulation scheme.

The unit probes mysterious fires in the garment district.

The detectives discover that the CIA is involved in a money-laundering scheme at a bank in a Cuban neighborhood.

A serial killer gives male victims tainted drugs.

Nell's ex husband comes back and ask's Nell for protection from the mob. Nina and J.C. become close.

Lt. Barker gets involved in a bank robery. G cathes Nina and J.C. in bed together.

Nina and Stone go undercover as owners of a garbage company. Nina and J.C. deal with their emotions of sleeping together and G catching them.

When a woman becomes a fugitive, Nina uses her only resource to help find her, her daughter. Stone's life becomes threatened.

A radical group kidnaps a child for bargaining purposes; Moreno gets even for the death of her husband and her partner when she meets Jordan in prison.