Elenco

• William Sylvester — Layton / Steve Ross
• Mai Zetterling — Ruth Lombard
• John Meillon — Johnny Hemick
• Anthony Dawson — James Dawson
• Neil McCarthy — Leo Farrell
• Joseph Fürst — Paul Varna
• Harry Baird — Gill Hall
• John Phillips — Chief Superintendent Gault
• Victor Brooks — Inspector Adams
• Diana King — Maggie Dawson
• Gerard Heinz — Jake
• Nan Munro — Sarah Bennett
• Ronald Adam — J. B. Wykeham
• Neil Wilson — Pat Ryan
• Sidney Vivian — Sam French
• William Sherwood — Bank Manager
• Andrew Laurence — Bank Clerk
• Patricia Shakesby — Typist
• Anthony Baird — City Constable
• Tom Clegg — Dropkick
• Meadows White — Mortuary Attendant
• Fred McNaughton — Police Superintendent

Argumento

• Peter Barnes — writer

Realização

• Cliff Owen — director
• René Dupont — assistant director
• Kay Rawlings — continuity

Produção

• E.M. Smedley-Aston — producer
• Clifton Brandon — production manager

Direção de arte

• George Provis — art direction

Câmara

• Geoffrey Faithfull — director of photography
• Frank Drake — camera operator

Montagem

• Antony Gibbs — editor

Som

• Ken Jones — music
• Red Law — sound recordist
• Ken Jones — conductor
• Bill Salter — sound recordist

Guarda-roupa e maquilhagem

• Jill Carpenter — makeup artist
• Betty Sherriff — hairstylist