Cat and Vincent are unsure if they can trust Alex with the truth about his past. Evan realizes that Claire, the woman he is dating, is hiding things from him. Heather meets and falls for Joe's younger brother Darius, and Vincent tries to win over Cat with romantic gestures for Valentine's Day.

New Assistant District Attorney Gabe Lowan arrives at the precinct, suspicious that cases involving the vigilante are being mishandled, and wanting answers. Cat is determined to protect Vincent at any cost, which includes tracking down a witness and threatening him at a gala masquerade ball. Meanwhile, Vincent worries he may lose control if he gets romantically involved with Cat.