Billy Wade is an ex-gunslinger who is approached by his outlaw brother Matt, not long out of prison, to help him with a big-time robbery. Matt forces Billy's participation with an offer he cannot refuse, unaware that Billy is actually working on the side of the law.

Michael Lanyard is suspected of stealing two fabulous diamonds from a vault in Scotland Yard, where they were being held for safekeeping, but the Yard can't prove he did it. Later, Lanyard is summoned by a member of the nobility to help the latter raise money to pay a blackmailer. Lanyard later finds evidence to reveal the diamonds as having been stolen by a famous stage star.