"The Claydon Treasure Mystery" stars reliable John Stuart as an engineer (Peter Kerrigan) interested in solving mysteries, who becomes involved in investigating murders at Marsh Manor, home of the wealthy Claydon family. Plenty of suspects to choose from, Kerrigan believes that the murders may be connected to hidden treasure on the estate.
Cast

John Stuart
Peter Kerrigan

Garry Marsh
Sir George Ilford
Annie Esmond
Lady Caroline Claydon

Campbell Gullan
Tollemache

Evelyn Ankers
Rosemary Shackleford

Aubrey Mallalieu
Lord Claydon

Finlay Currie
Rubin

Joss Ambler
Inspector Fleming
Vernon Harris
Rhodes - the Butler
Roy Russell
Unknown
Ernest Borrow
Unknown
Valentine Dunn
Margaret McGregor - the Maid

Ian Fleming
Dr. Cleveland - Coroner

Wilfrid Hyde-White
Holmes

John Laurie
Wilson - the Valet
Ben Williams
Gamekeeper

Donald Wolfit
Executive
Richard Parry
Sgt. Midgley