Michael Wilding as Philip Trent

Margaret Lockwood as Margaret Manderson

Orson Welles as Sigsbee Manderson

John McCallum as John Marlowe

Miles Malleson as Burton Cupples

Hugh McDermott as Calvin C. Bunner

Jack McNaughton as Martin

Sam Kydd as Inspector Murch

Kenneth Williams as Horace Evans

Geoffrey Bayldon as Reporter in Court

Ernest Blyth as Concert Attendee

Robert Cawdron as Police Constable

John Chandos as Tim O'Reilly

Anthony Collins as Conductor

Henry Edwards as Coroner

Eileen Joyce as Pianist

Ben Williams as Jimmy - Reporter