With a sparkling script by Leslie Charteris, creator of "The Saint" - the latest crime wave has Scotland Yard baffled. Commissioner Hope (Sir Guy Standing) sends two of his officers (Billy Bevan and Charles McNaughton) to the Midnight Club to check up on a couple of shady characters - Colin Grant (Clive Brook) and Arthur Bradley (Allan Mowbray) and a girl, Iris Witney (Helen Vinson). There have been a number of jewel robberies around town recently, but, unknown to the police, these three have the perfect alibis!!! They have found "doubles", and while they are out committing the robberies, their doubles spend the night at the club, confusing the two officers who are on their tail.