Patrick Barr

Character: Det. Insp. Alan Wembury

Alexander Knox

Character: Dr Anthony Lomond

Wilfrid Lawson

Character: Maurice Meister

Sonnie Hale

Character: Samuel Cuthbert 'Sam' Hackett

Louise Henry

Character: Cora Ann Milton

John Longden

Character: Inspector Bliss

Patricia Roc

Character: Mary Lenley

Peter Croft

Character: John Lenley

Arthur Hambling

Character: Det. Sgt. Richards

George Merritt

Character: Police Station Sergeant

John Turnbull

Character: Prison Governor

Charles Eaton

Character: Col. Walford

Cameron Hall

Character: Drunken Scotsman (uncredited)