Eric Portman as Victor James Colebrooke

Dulcie Gray as Anne Fielding

Derek Farr as Jack Williams

Roland Culver as Chief Inspector Conway

Stanley Holloway as Sergeant Sullivan

Barbara Everest as Mrs Colebrooke

Bonar Colleano as Corporal Nick Mappolo

Jenny Laird as Jeannie McLaren

Kathleen Harrison as Florrie

Bill Shine as Detective Ellis

Viola Lyel as Mabel Cooper

John Salew as Detective Walters

John Ruddock as Glover

Edna Wood as Miss Kemp

George Carney as Boat Rental Agent

Mary Mackenzie as Girl at Fair

Wilfrid Hyde-White as Guide in Madame Tussaud's

Moira Lister as Miss Willis

Gerhard Kempinski as Head Waiter

Caven Watson as Underground Attendant

Wally Patch as Merry-Go-Round Barker

Frank Atkinson as Chip Shop Customer

Marie Ault as Flower Seller

Beatrice Campbell as Muriel

Howard Douglas as Head Park Keeper

Alexander Field as First Newspaper Seller

Soja Ooternan as Singer

Tony Quinn as Mugsy Knight

Johnnie Schofield as Chip Shop Owner

Harry Terry as Park Keeper

Klaas van Beek as Singer