When You Have to Go There, They Have to Take You In

S1, E9: Pritchard and Duval join forces to track down a serial killer, and Alexa and  Connor try to procure key technology from Lookinglass. Meanwhile, the bond between Mary and Pritchard has grown stronger, but Otto goes to great lengths to make sure Mary never leaves him, and Gracie suspects there is more to Pritchard than what he has told her.