Industrialist George Stark (Teodoro Corra) invites a small group of wealthy friends to his private island for a weekend of relaxation and light business. He wants them to meet the brilliant chemist Gerry Farrell (William Berger) who has invented a new chemical process. Against his wishes, Farrell is engaged in business discussions revolving around millions of dollars worth of investment. As each of the potential investors goes behind each other's back, fear and mistrust grow, particularly once the guests begin turning up dead.
Description by Image Entertainment:
George Stark, a wealthy industrialist and playboy, gathers a group of bourgeois friends at his isolated island beach house for the weekend. His guest of honor is Gerry Farrell, a brilliant chemist who has discovered a remarkable new formula. Farrell doesn't care to discuss business, but the businessmen in attendance are determined to talk money--in the millions. Each of them angers the others with secrets bids and back alley deals, spawning an atmosphere of distrust, exacerbated by the sexual intrigue in the air between the men and their various wives and mistresses. Suspicions begin to rise when the guests begin to turn up dead, one by one! Mario Bava strikes again--and again, and again--in this stylish and wicked whodunit, never before released in America!