The BAU tracks a serial killer in Wisconsin; Kate is faced with trouble when her niece, Meg, starts acting out.
The squad is forced to work with a private investigator when a clothing designer is found poisoned and his wife reported missing; Jane asks Maura to teach her mother how to handle her finances.
A ransom-seeking hacker infiltrates a vice admiral's laptop and threatens to erase his personal and professional files; Alex takes time off to assist her mother.
When Willis and Rox are called to the scene of a wildfire in the mountains of Los Angeles to tend to the injured firefighters, they choose to stay to look for a missing young boy who was separated from his father in the chaos.