Edmund Lowe as Mark Peters

Wendy Barrie as Joan Marplay

Bruce Lester as Lord Noel Stratton

Forrester Harvey as Allistair McNab

Walter Kingsford as Amos Craven

J.M. Kerrigan as Flinters

Barlowe Borland as Lucus Marplay

Boyd Irwin as Sinclair Ellis

Vernon Steele as Nigel Partridge

Reginald Barlow as Sir John Digby

Leyland Hodgson as Dade

Robert Noble as Inspector Wren

Phyllis Barry as Miss Carson (uncredited)

Wilson Benge as Bradley the Butler (uncredited)

Hal E. Chester as Copy Boy (uncredited)

Herbert Evans as Kirby the Assistant Editor (uncredited)

Denis Greene as Leets (uncredited)

Anne Nagel as Laura the Secretary (uncredited)

Alexander Pollard as Eddie the Sanitorium Attendant (uncredited)

John Rogers as Printer (uncredited)

Michael Vallon as Wilkes the Editor (uncredited)