The grandson of Dr. Jack Griffin, the original Invisible Man, runs a print shop in Manhattan under the assumed name of Frank Raymond (Jon Hall (actor)). In his shop he is confronted by four armed men who reveal that they know his true identity. One of the men, Conrad Stauffer (Cedric Hardwicke), is a Gruppenführer of the Schutzstaffel, while a second, Baron Ikito (Peter Lorre), is Japanese. They offer to pay for the invisibility formula and threaten amputation if it is not revealed. Griffin manages to escape with the formula in his hands.