Discover
Dennis O'Keefe
Paul Mitchell
Coleen Gray
Mary Mason
Hugh Williams
Sir Richard Aldingham
Guy Middleton
Smith
John Laurie
Henry Mason
Gerald Case
Randall
Seymour Green
Weston
Eliot Makeham
George
Stanley Van Beers
Cartwright
Ellen Pollock
Miss Fossett
Morris Sweden
Pettigrew
Dora Bryan
Barmaid
Arnold Bell
Police Inspector
Michael Ward
Art Salesman
Clifford Buckton
Lodging House Keeper
Leslie Phillips
Boy Student
Marianne Noelle
Girl Student
Billie Whitelaw
Waitress
John Wadham
Thug
Frank Atkinson
uncredited
Tom Clegg
uncredited
Guy Deghy
uncredited
Harold Sanderson
uncredited
Johnnie Schofield
uncredited
Leonard Sharp
uncredited
Philip Ray
Bearded Tramp
Hyma Beckley
Art Gallery Visitor (uncredited)
Jimmy Cains
Howard - Tate Gallery Attendant (uncredited)
Dan Darnelli
Pub Customer (uncredited)
Norman Fisher
Museum Visitor (uncredited)
Robert Gregory
Art Gallery Visitor (uncredited)
Charles Hammond
Pub Customer (uncredited)
Dido Plumb
Museum Visitor (uncredited)
Jim Tyson
Stevedore (uncredited)
Art
Denis Wreford
Art Direction
Costume & Make-Up
U. P. Hutchinson
Makeup Artist
Editing
Charles Hasse
Editor
Jim Connock
Editor
Production
Theo Lageard
Production Manager
Robert Faloon
Production Accountant
Ambrose Grayson
Associate Producer
Steven Pallos
Producer
John Jones
Casting
Art
Denis Wreford
Art Direction
Costume & Make-Up
U. P. Hutchinson
Makeup Artist
Editing
Charles Hasse
Editor
Jim Connock
Editor
Production
Theo Lageard
Production Manager
Robert Faloon
Production Accountant
Ambrose Grayson
Associate Producer
Steven Pallos
Producer
John Jones
Casting