Irish artist Megan lives in Dublin with her Italian husband Leo. When his uncle Monsignor Domenico, a powerful Catholic priest famed for his healing powers, dies and leaves Leo the ancient family house, the couple travel to southern Italy to deal with it.
Leo intends to sell the house to his brother Nicola, the town's priest. But Leo soon rediscovers his love for the town and old friends. Megan too is enchanted by the place.
They decide to stay for the summer. During the hottest hours of the day Megan stays at home where strange presences begin to disturb her. She starts to uncover clues to a mystery in Leo's family which he refuses to discuss. Meeting Father Von Galen, a priest sent by the Vatican to investigate Domenico's beatification process, Megan soon finds herself in a dangerous struggle against forces willing to hide the truth at all costs.