Mysterious Mynds

"Stressed out?" Hotch's voice was dangerous. "I've got a hundred possible homicides, a vast cult-like network, and two agents who just vanished in front of me. Yeah, I'm stressed out." As the BAU team embarks on possibly its biggest and definitely its strangest case yet, an old friend will resurface and two team members will find themselves stranded in a bizarre world. JJ/Reid.