Detective Murdoch investigates the theft of a valuable Rembrandt painting. He attended its unveiling at a lavish reception and saw the painting go on the elevator on the 11th floor and go directly to the first floor where Constables Crabtree and Higgins were waiting for it to arrive. When the doors open, all they find is a dead security officer and no sign of the painting or how it might have been removed. He soon finds the thieves, both dead, but there is no sign of the painting. They were professional thieves from Chicago and Murdoch determines that it is all part of a scheme to sell forgeries of the painting in question. While he tracks down the forger, he's not sure he's tracked down the mastermind behind the scheme.