Gideon, Hotchner and their team reopen the unsolved case of a serial killer who has attacked someone for the first time in 20 years.
Cooper returns to the online dating game with surprising results, Addison goes on a date with one of Violet's patients, and Naomi and Sam make a house call at a convent.
The family goes to a water park, leaving Dewey at home with a no-nonsense babysitter.
An e-mail exposes estate fraud and a deadly disaster is averted. Also, there is cemetery vandalism, an 8-year-old's bond with his dog, and a John Doe obituary leads the family to the decedent.
When Rocky and CeCe start to argue, Gary recommends they visit a therapist.