 Eve Gill (Jane Wyman), an aspiring young actress, shelters a fellow acting student, Jonathan Cooper (Richard Todd), from the police. He is suspected of murdering the husband of his mistress, Charlotte Inwood (Marlene Dietrich), a famous singer. Jonathan claims that he became implicated when he tried to help Charlotte destroy the evidence. Eve s eccentric father, Commodore Gill (Alastair Sim), agrees to hide Jonathan in his house while she proves his innocence. To do this, Eve becomes Charlotte s temporary maid. Eve s Father devises a plan to force Charlotte to confess in front of the inspector investigating the case, Wilfred Smith (Michael Wilding). When the plan doesn t work, Eve tries blackmailing Charlotte into a confession while the police listen outside her dressing room. Charlotte agrees to pay, but insists that Jonathan is the real killer.