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Menahem Golan directed this low wattage heist movie enlivened by Robert Shaw in a dual role as twin brothers. Shaw plays a jaded British aristocrat who decides to become a jewel thief in order to get back at his brother (also played by Shaw), a security expert who has constructed an impregnable vault in Israel where a cache of diamonds are stashed. The tired plot concerns the intricate preparations for the diamond theft and the time-consuming task of cracking the safe. Shaw organizes a gang consisting of Richard Roundtree and Barbara Hershey. Shelley Winters is also on hand as an American widow who tries to seduce Shaw.