When a train full of priceless artwork is replaced with forgeries by the Cannoner, Batman goes on a quest to find out who stole the priceless works, and enlists the aid of the Atom. The Cannoner, meanwhile, has tricked circus midget Lilli De La Pooche into taking a shrinking pill that shrinks her down to three inches and blackmails her into helping him stash the artwork until the heroes are thrown off.
