Two diamonds disappear from a police vault, the police immediately suspect the former jewel thief Michael Lanyard - the Lone Wolf (Gerald Mohr) as they know he is in London, officially doing research for a book he is writing.
Lanyard is recruited by a member of the aristocracy (Vernon Steele), who is hard up, to sell some jewels for him. Meanwhile, Lanyard is starting to suspect stage star Iris Chatham (Evelyn Ankers) is involved in the diamond robbery, though the police still stubbornly suspect him!
Mohr and Eric Blore as Jamison worked well as a team, though this was the last time they worked together in this series, and the eleventh and final time Blore played Lanyard's assistant. A decent film with the usual fast moving plot and various plot tangents and red herrings. Maybe we have seen it all before (many times) but it is still a good film.
