Drake is following a young lady, Kathleen, who has been selling secrets. He follows her to France where he confronts her with what he knows. She is the last link in a long chain of couriers from an aircraft research establishment. Kathleen is being blackmailed with some indecent photographs and her role is to take the information to France. Drake offers her the chance to redeem herself by helping him find who is employing her, which she does. When she is murdered, Drake is arrested for the crime. He manages to escape but has difficulty in finding a safe haven.
—jem