Ben and Ryan team up with Theresa Baldoni, a tough New York cop, who comes to California to catch the man who murdered another cop; only she's not interested in justice, she wants revenge. Carroll becomes romantically involved with Baldoni. Nora and Walt protect a young girl orphaned after a hit man kills her mother.

The unit investigates when a policeman is murdered in bed and quickly finds a suspect, his wife, Andie Harper! Nora worries that the murder may have been too easy. Ben concurs. The squad reopens the investigation. Ben and Ryan look at each other suspiciously, because both once had an affair with Andie Harper. They both investigate and find out how sexually voracious Andie Harper is.