A low-ranking Secret Service agent is conned into supplying information to Eastern Bloc countries. Although he is not a suspect due to his unimportant position, when his office partner is hauled in as a suspect he realises he has got himself into very deep water.
Nicol Williamson
as Maurice Castle
Richard Attenborough
as Colonel John Daintry
Derek Jacobi
as Arthur Davis
John Gielgud
as Brigadier Tomlinson
Iman
as Sarah
Joop Doderer
as Cornelius Muller
Robert Morley
as Doctor Percival
Ann Todd
as Castle's Mother
Anthony Woodruff
as Dr Barker
Keith Marsh
as Porter
Gary Forbes
as Sam
Angela Thorne
as Lady Mary Hargreaves
