When the BAU is called to Kansas City to investigate a series of murders, a tense reunion ensues between Blake and her father, a retired police captain, and her brother, a detective, who must work together to help solve the crime.

While the BAU looks for a vigilante killer on the loose in Cleveland, Rossi is concerned when his former Marine sergeant goes missing and heads to Los Angeles to find him. Also, the secret JJ has been keeping from the team may be catching up with her.