In New York CIty, Paul Baker has stolen the plans for a radio-controlled torpedo and had them tattooed in invisible ink on the back of his companion, Rita Lenox. They cold-bloodedly shoot the artist, and their plan is to have Rita impersonate newspaperwoman Sidney Royce, take her seat on the Clipper to Lisbon and sell the plans to the highest bidder. Things go awry and Sidney takes her own seat en route to Lisbon, assigned to join the paper's Lisbon correspondent, Kenneth Harper. Sidney blissfully arrives in Lisbon unaware that her arrival as 'the lady with the plans' is being awaited by the Nazis, led by Baron von Kemp, and also by the English faction headed by Ronnie Dean.
—Les Adams <longhorn1939@suddenlink.net>