 The team investigates the Dawes couple on death row in Florida State Penitentiary for thirteen (or more) murders on young blonde girls in 1985; a dozen girl corpses were found under diagnosed sexual psychopath Jacob s garage after the police got an anonymous call from a never identified female claiming to have seen him with several of the girls, which he would have lured to his home workshop promising non-existent marijuana where he tortured and dismembered them. Sarah Jean Dawes  the Ice Queen  née Mason only confessed killing her own two-year old son Riley, Jacob would have ordered her to kill him because he slowed down their flight. Sarah s mother Deb Mason claims she was a normal shy girl till she met Jacob, her late father was a strict soldier but only hit his wife. Gideon concludes from a letter to her mother and an interview that Sarah Jean is physically innocent, just blames herself for failing to stop Jacob and tipped the police herself. Jacob, who clearly craves notoriety, refuses to tell Aaron "Hotch" Hotchner or Jennifer "JJ" Jareau if there are more corpses, but offers to poker for one or a smell of Jennifer s hair, loses and claims there are no others. When told Sarah got a stay of execution, Jacob spontaneously offers their son s burial place, a gazebo he built, but the corpse is 14-year old Ashley Farley s. Gideon believes to deduct from Sarah utterings Riley is alive, somewhere Jacob doesn t know; he searches her cell while she is given a last walk, against regulations, and finds a photo, probably Riley 15 years older...