Claiming that he doesn't know his own past, a rich man enlists an ex-con with an odd bit of detective work. Gregory Arkadin says he can't remember anything before the late 1920s, and convict Guy Van Stratten is happy to take the job of exploring his new acquaintance's life story. Guy's research turns up stunning details about his employer's past, and as his work seems linked to untimely deaths, the mystery surrounding Mr. Arkadin deepens.

Orson Welles
as Gregory Arkadin

Akim Tamiroff
as Jakob Zouk

Grégoire Aslan
as Bracco

Patricia Medina
as Mily

Jack Watling
as Marquis of Rutleigh

Mischa Auer
as The Professor

Peter van Eyck
as Thaddeus

Michael Redgrave
as Burgomil Trebitsch

Amparo Rivelles
as

Frédéric O'Brady
as Oscar