The team scrambles to stay one step ahead of Madeline and Ivy (Mary Elizabeth Mastrantonio, Julee Cerda) as they get closer to the location of the hidden bunker in the new episode "Ghost Train." They soon realize, however, that somewhere there's a mole who is feeding Madeline information. As their adversary's plan starts taking shape, Jane, Weller (Jaimie Alexander, Sullivan Stapleton) and their colleagues may have to take some desperate measures.