Summary: 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. (imdb)

Poster submitted by Gauntlet

Genre: Suspense/Thriller

Country: UK

Directed By: Don Siegel

Written By: Clive Egleton, Leigh Vance

Starring: Michael Caine, Joss Ackland, Delphine Seyrig, Donald Pleasence, Clive Revill, John Vernon

More information at the Internet Movie Database