In Name and Blood (In Birth and Death)

With Gideon missing, and Hotch and Prentiss off the team, Prentiss having resigned and Hotch seeking a transfer, Morgan, Reid and JJ investigate one of its most difficult cases yet as they track a serial killer in Milwaukee who's abducting women in public places by using his son as bait. Hotch comes home from the case to find Haley and Jack gone, while Reid arrives at Gideon's cabin in search of Gideon but finds a letter along with Gideon's weapon and badge. The episode ends with Gideon driving off into the sunset, hoping to regain some kind of belief in happy endings.