Carroll Baker plays a dual role as translator Julie Harrison and her twin sister Mary. The serpentine plot begins as Julie tells her lawyer Dave Barton that Mary's life is being threatened in London while Julie herself is being stalked by a mysterious stranger in Amsterdam.
Carroll Baker
as Julie Harrison / Mary Harrison
George Hilton
as Tony Shane
Stephen Boyd
as Dave Barton
Lucretia Love
as Margaret
Luciano Pigozzi
as Steve Hunter
Daniele Vargas
as James Marlowe
Ivano Staccioli
as Hank
Franco Ressel
as Inspector Rinker
Carla Mancini
as
Gianni Pulone
as
Roberto Messina
as
Maria Carla Ricotti
as
