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Movies like The Swiss Conspiracy (1976)

A Swiss bank discovers some of its clients are becoming the victim of a brilliant blackmailer. The bank's president contacts David Christopher, a former agent with the U.S. Treasury, to help discover who the blackmailer is and to foil his plot. As Christopher delves into the mystery, he uncovers a complicated web of intrigue, car chases, and shoot-outs that takes all of his wits to unravel.