The Black Windmill

A British agent's son is kidnapped and held for a ransom of diamonds. The agent finds out that he can't even count on the people he thought were on his side to help him, so he decides to track down the kidnappers himself.

Cast: Michael Caine, Donald Pleasence, Delphine Seyrig, Clive Revill, John Vernon, Joss Ackland, Janet Suzman, Catherine Schell