The two ghosts next appear during the "Children's Crusade" crossover. In this story it is revealed that they have been studying the school's library books and films (mostly children's adventure fiction) in the hopes of learning how to become detectives. In their first case, they are hired by a young girl to discover what happened to the children of a small British town ("Flaxdown") who have all disappeared. This storyline connects to various other Vertigo titles, such as Swamp Thing, Animal Man, Doom Patrol, and Black Orchid. They were briefly seen tracking down the magician Tim Hunter whilst he was hiding out at one of the Inns Between the Worlds, but were captured and supposedly returned to Death's domain by a coachman - although the coachman actually promised to allow them to escape as he didn't force any spirit to return to death against its will.