Aaron Hotchner is contemplating a transfer to another unit, and Emily Prentiss is quitting the FBI, and Jason Gideon is missing. The team, led shakily by Director Erin Strauss, is called to Milwaukee to investigate a serial killer who has had 5 female victims. Horribly, it seems that the killer is using his young son to lure in the victims. As Aaron rejoins the team, along with Emily, this puts his marriage on shaky ground. We learn the fate of Jason Gideon, as this was the final episode starring Mandy Patinkin, who has left the show.