After a young girl is struck by a car in an illegal street race, McCall tracks down the person responsible for the hit-and-run. Meanwhile, Dee contemplates the idea of following in her mother's footsteps to join the armed forces.

After a high-powered real estate developer is killed by a moving subway train, his widow hires McCall to investigate his death. Meanwhile, Aunt Vi and Dee visit an old neighbor living in a nursing home who may need their help.

After Dante's old training partner is taken hostage while working undercover in an illegal casino, McCall hires J.J., a former gambling addict, to assist with the mission. Meanwhile, Dee joins a peer counseling group and learns that some students have been bullying her on a social media page.

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.

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.

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.