Michael Lanyard (Gerald Mohr) 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.
Gerald Mohr
as Michael Lanyard
Eric Blore
as Claudius Augustus Lucius Jamison
Nancy Saunders
as Ann Klemscott
Evelyn Ankers
as Iris Chatham
Richard Fraser
as David Woolerton
Queenie Leonard
as Lily, Kelmscott's Maid
Denis Greene
as Detective Inspector Garvey
Alan Napier
as Monty Beresford
Heather Wilde
as
