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Romolo Guerrieri directed this well-constructed thriller from a screenplay from genre specialist Ernesto Gastaldi. Returning to Geneva from their honeymoon, newlyweds Deborah (Carroll Baker) and Marcel (Jean Sorel) meet a man named Philip (Luigi Pistilli), who blames Marcel for the suicide of his girlfriend. Spaghetti-western star George Hilton appears as an artist-neighbor with a secret, and Evelyn Stewart (aka Ida Galli) also appears. The plot has many twists and turns, but Guerrieri manages to keep it on track until the intriguing conclusion.