Everybody in The Midnight Club is seeing double, and it's all the handiwork of slick London criminal mastermind Colin Grant (Clive Brook). Anyone who wants to commit a crime and get away with it had better get in touch with Grant, who obligingly provides exact doubles of the criminals so as to establish an alibi. At present, Grant and his minions are planning a big-time society jewel heist. Admittedly baffled by Grant's near-perfect racket, Scotland Yard commissioner Hope (Sir Guy Standing) calls in American sleuth Nick Mason (George Raft) to help out. Nick wastes no time going to work, not only insinuating himself into the "Midnight Club" gang but also wooing away Grant's sweetheart Iris Whitney (Helen Vinson).
by Hal Erickson synopsis