The Drew Crew goes on the hunt for an underground prison that may hold answers to the Frozen Hearts killings - all while following a lead on a relic that could cure George of the paranormal affliction that's shortening her lifespan. Ace tries to enlist Amanda Bobbsey in bringing her father to justice. 

Nancy, Bess, Agent Park and Temperance have to join forces when an attempt to trap a killer ends up unintentionally unleashing a deadly supernatural entity that feeds on people's sorrows. Meanwhile, Ace and Ryan discover a haunting at the Historical Society, and George meets a friend from Nick's past who may have secrets of her own.