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.

McCall races to help Dante and Big Ben after they are ambushed by a group of suspicious attackers and a major family secret is revealed. Meanwhile, at a block party, Aunt Vi tries to maintain her status as the reigning queen of the annual cobbler baking contest and Dee suspects a mutual friend may have stolen prize money.