The Mediterranean island that Michael Forbes is considering for his father's tourist agency looks peaceful enough, and even the evil tales of the Grotto of Tiberius, haunted by a Roman tragedy, seem just fanciful peasant superstition and not sufficient to bring in the tourist trade. However, when Michael, a stubborn young Yorkshireman, falls in love with the bright-haired Cristina, he begins to recognize the force of island feuds and superstitions...