New agents, Reardon and Robinson, face the rookie treatment. Unit's leader, Olansky, visits his troubled friend Nick, who's deep undercover. The team investigates a child kidnapping case complicated by the fact that the mother is a D.A.
Olansky tries to get his risky rescue plan for the kidnapped boy greenlit. His partner, agent Stoddard, has car trouble. Agent Robinson catches a child drug dealer which makes his friends from the hood dislike him.
Vitriolic talk radio host Jules Rozack (J.T. Walsh) is taken hostage on-air by a disgruntled fan, Loren Bitts (Zeljko Ivanek). Olansky tries to talk them both down. Reardon confronts her abrasive superior, Jack DiRado.
Agents Rooney and DiRado hunt for an international assassin known as the Sandman. Reardon and DiRado bicker. Olansky tries to get Nick out of deep cover after he beats up a cop. Stoddard scores a date. Rooney deals with being a single mom.
DiRado and Robinson are after a gang of spoiled rich kids robbing banks, Reardon visits Nick's wife, Olansky sees his old girlfriend, Stoddard's girlfriend's tell-all Playgirl article embarrasses him, Rooney's ex husband cuts her off.
DiRado and Rooney go undercover as money launderers to catch racketeer Frank Saretti (played by James Russo), but DiRado's overly eager protege and Rooney's abusive ex cause them trouble. Reardon asks Nick about his home life.
A hitman guns down Nick in front of Reardon. DiRado tries to calm her down. Office of Professional Responsibility suspects Nick of having been corrupt. Olansky tries to prove they're wrong. Stoddard warns Robinson not to be OPR's snitch.
Stoddard, Rooney, Robinson and DiRado pit a gang of armed robbers who pretend to bi FBI agents against one another. Robinson also looks for his missing junkie brother. Meanwhile, elderly Miss Wilson confesses a 1940s robbery to Reardon.
The team raids a drug warehouse based on a tip from Robinson's junkie brother, Robert. However, Robert is also there and goes on the run. Internal affairs question Stoddard and Rooney over her vengeful ex's accusations against her.
A woman brought into the U.S. by an Asian sex trafficking ring agrees to testify against them only if Stoddard can get her a green card. DiRado looks for his missing friend, a disillusioned undercover agent. Robinson dates agent Vargas.
Olansky does everything he can to get Nick's killer, even if it means bending the law. Rooney's unhinged ex husband makes another scene at her place of work. Robinson is investigated for hiding the fact that he has a junkie brother.
El Nino hits L.A. creating a huge storm that traps the team in the office for the night together with a mob hitman turned state witness they need to crack. His street charm slowly wins them over, even Rooney. Stoddard and Reardon kiss.
Olansky survives a hit attempt. Rooney asks a twitchy informant she's very fond of to infiltrate the chop shop of the gangster behind it. At J. Edgar Hoover party, Olansky comforts his daughter, and Stoddard and Reardon discuss the kiss.