McCall's personal and professional lives collide when Delilah and her friends are threatened by a European crime syndicate for being eyewitnesses to the outfit's execution of a drug cartel boss.

McCall races to find Dante when he’s abducted by a pair of panicked deputies who fear reprisal, after they detained Dante without cause and used excessive force before realizing he’s a fellow cop. Alone and injured, Dante experiences hallucinations that reveal his complicated childhood.

McCall’s determination to apprehend Mason Quinn, the criminal responsible for Bishop’s death, veers into a dangerous obsession that could cost her everything. Also, Delilah finally meets her mother’s vigilante team when she requires Harry and Mel’s help to prove a fellow classmate made her best friend a victim of revenge porn. Second season finale.

After an operative kills all but one of the employees at a marine biology research group, McCall and the team join forces with Colton Fisk when they discover a connection between the murders and a secret CIA program he was involved in.

After Mel is reunited with her brother, McCall helps him blow the whistle on his former unit's unethical practices before it's too late. Aunt Vi and Trish's relationship becomes fractured by Vi's need to protect McCall's true identity.