British photographer Don Tierney is killed in a car-crash on the island of Rhodes. When his widow, Anne, goes there to complete his assignment, she is apparently haunted by his ghost. Does the key to his death lie in the crusader castle of Hagios Theodoros, where influential political figures meet in secret? And what of the handsome owner of the castle, Raoul Lavallière, who takes a romantic interest in Anne? Supernatural forces and human conspiracies combine, leading Anne and her friends into danger and a confrontation with a 700-year-old power.