演职人员
Bob Beacham
罗伯特·比蒂
Mary Game
Rona Anderson
Tom Harmon
克利福德·埃文斯
Det. Insp. Charlton
Edward Lexy
Olive Tavy
Olga Lindo
Self - The Twenty Questions Team
Daphne Padel
Self - The Twenty Questions Team guest artiste
Jeanne De Casalis
Self - The Twenty Questions Team
Jack Train
Self - The Twenty Questions Team
Stewart MacPherson
Self - The Twenty Questions Team 'Mystery Voice'
Norman Hackforth
Self - The Twenty Questions Team
Richard Dimbleby
Maurice Emery KC
Harold Scott
Echo News editor
Liam Redmond
Mohammed Ali
Homi Bode
Gen. Maitland
Kynaston Reeves
Stewart MacPherson's secretary
Sonya O'Shea
Police Commissioner
Frederick Leister
Police Officer 'Tiny' White
Wally Patch
John Grimshaw
John Salew
Record News editor
Gordon McLeod
Cheshire Cheese waiter
Philip King
Doctor
Arthur Young
Mrs. Tavy's Neighbour (uncredited)
Merle Tottenham
Frederick 'Ricky' Tavey (uncredited)
Meadows White