Plot: 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.
Alternative Plot: Hated by his boss (Delphine Seyrig), estranged from his wife (Donald Pleasence), a British secret agent (Michael Caine) tries to rescue his kidnapped son.
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