Season 3 ends with Carrie being unable to utilize her perfect memory after an assassin slips her a potentially fatal dose of poison that attacks her brain. Al and the team desperately search for an antidote.
A TV star is murdered in his dressing room, and the investigation plunges Carrie and Al into the disturbing world of celebrity obsession.
Carrie and Al investigate the murder of a high-end matchmaking service employee and discover the victim had many secrets. As they uncover each one, the suspect list grows longer.
Carrie conducts a secret investigation when Homeland Security takes over a bombing case from Major Crimes and concludes that it is tied to terrorism. Meanwhile, Joanne makes friends with Cherie's daughter Maya.
The murder of a CEO leads Carrie and Al to dig into the secrets of students and faculty at an elite prep school where the victim's child attended.
Carrie and Al's investigation into the death of a college dropout takes a surprising turn when they discover he had been living in an off-the-grid community on an abandoned island near Manhattan.
Eliot is forced to face his past and current demons when one of his oldest friends, who was a campaign manager for a mayoral candiate, is murdered.
A parolee Al helped put in jail is murdered and Internal Affairs targets him as the prime suspect in the case. Meanwhile, Carrie conducts an off-the-books investigation to prove Al is innocent.
Carrie and Al must find the connection between a murdered Coast Guard officer, an explosion on a chartered boat that killed a famous chef and a missing block of C-4.
A city official is murdered and Carrie recognizes the victim as someone she played poker with at an underground casino. She then puts her career on the line by admitting her illegal activities and volunteering to go back to the tables undercover.
A reporter who broke a scandalous story about the director of the NSA is murdered. Meanwhile, Simms returns to assist Carrie and Al reconnects with an old girlfriend.
Carrie and Al investigate when a championship boxer is beaten to death. The probe focuses on the victim's past and why he apparently didn't defend himself or fight his attacker.
Season 3 begins with Carrie and Al working with the Secret Service on a murder investigation. The probe uncovers a counterfeiting ring that is run by an assassin.