Christopher Jones as Leiser

Pia Degermark as The Girl

Ralph Richardson as LeClerc

Anthony Hopkins as John Avery

Paul Rogers as Haldane

Susan George as Susan

Ray McAnally as Undersecretary of State

Robert Urquhart as Johnson

Vivian Pickles as Mrs. King

Anna Massey as Avery's Wife

Maxine Audley as Mrs LeClerc

Timothy West as Taylor

Michael Robbins as Truck Driver

Cyril Shaps as East German Detective

Peter Swanwick as Finnish Policeman

Guy Deghy as Fritsche

Angela Down as Chelsea Girl

Paul Maxwell as CIA Man

Frederick Jaeger as Pilot

Jill Goldston as Pub Patron (uncredited)

Russell Lewis as Avery's Child