The team races against the clock after Mel is kidnapped by a member of her veteran support group and his older brother. Meanwhile, Dante is offered a position with the NYPD's Special Investigation Unit in Los Angeles.

When a conman from Dante’s past attacks a prison transport, McCall and the team race to take him down. Meanwhile, Aunt Vi and Dee’s girls’ trip is suddenly derailed when they find a woman squatting in their home, and Harry risks his relationship with Mel…

Dee asks McCall to help find her transgender friend when the teen goes missing. Meanwhile, Dante is surprised when Big Ben's parole officer approaches him to chaperone his father for an out-of-state trip.

When a former Chinese MSS agent is poisoned and comes to McCall for help, McCall tracks down the perpetrators and the antidote. Meanwhile, Aunt Vi encourages Dee to protest against a well-known climate change denier.

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.