As a young girl in India, beautiful, high-spirited Susanna Pleydell had first became aware of her special gifts to soothe the sick. But she had sacrificed that calling when she married the dashing and sophisticated Aubrey St. Clare. When they return home to London, however, Aubrey has changed. Susanna discovers she has married a man with a weakness for opium and the occult. And even more menacing, Aubrey has met the sinister Dr. Damien Adar, whose hold over him is fierce and frightening.