A gang of criminals murder a scientist, steal plans for a "radio-controlled torpedo" and have them tattood in invisible ink on the back of a woman named Rita, planning to sell them to the highest bidder. Paul Baker then murders the tattooer. Rita is to take the place of reporter Sidney Royce (Paulette Goddard) on an airplane bound for Lisbon. Baker has informed the British and the Nazis to contact "Sidney" there for the auction. Joe Scalsi is given the task of making sure that Sidney does not board the plane, but he is taken into custody by government agents. Rita witnesses this.