In November 1963, American intelligence case officer and former Marine Paul Christopher investigates the assassination of US President John F Kennedy.

Believing that the Kennedy White House was behind the assassination of Vietnamese President Ngo Dinh Diem, Christopher deduces that Vietnamese leaders had Kennedy assassinated as revenge.

When one of Kennedy's former advisers threatens Christopher not to discuss the matter with anyone else, Christopher quits the Agency and heads to Vietnam to find the truth.

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