McCall receives a desperate plea for help from her former CIA trainee, now a full-fledged agent, that leads her into a confrontation with Mason Quinn, the most dangerous enemy from her past in intelligence. In need of confidential information about the agent's latest assignment, McCall forms a tentative alliance with Carter Griffin, a by-the-book CIA handler.

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.

In the aftermath of her abduction, the walls between McCall’s family and vigilante life continue to crumble as those closest to her must come together for the first time to save her.

When a smuggler being detained by the CIA must be transferred quickly to a secure debriefing site, McCall works with Carter Griffin to ensure he arrives unharmed. Also, Dante deals with the possibility of his father being released from prison.