Jack pressures Olivia to move in together, but she's hesitant to take this step because she's unsure if she can trust him. Meanwhile, Maryellen comes back to town with a big announcement.

Dr. Hannibal Lecter has been under lock and key for three years at the Baltimore State Hospital for the Criminally Insane, when a new villain arises in Francis Dolarhyde, also known as "The Tooth Fairy." As the investigation unfolds Jack Crawford approaches Will Graham to help catch this vicious serial killer who is targeting families.

Cullen and Fong find themselves in peril as they transport a locomotive over the Sierra Nevada mountains. The Swede gains Phineas' trust.

Adam and Jamie tackle the ultimate aviation investigation: is the U-2 really the toughest aircraft in regular use to fly and land? The guys also take on the next big technological development in commercial delivery - remote control multi rotor drones.