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 gets surprising results with online dating; Addison has a date with one of Violet's patients; Naomi and Sam make a house call at a convent; Addison and Pete help a teenage mother as part of a Safe Surrender program.
The family goes to a water park, leaving Dewey (Erik Per Sullivan) at home with a no-nonsense baby sitter (guest star Bea Arthur). With Frankie Muniz, Jane Kaczmarek, Bryan Cranston and Justin Berfield.