The Marquis of Wynstanton has become involved with one of the beauties of London Society—Locadi, Lady Marshall. When her husband dies unexpectedly, the marquis sets out on a long journey to India and Nepal, hoping to avoid any gossip about their liaison.Upon his return, he resumes the affair but soon begins to suspect Locadi of using black magic to entice him to her. Almost in a panic, the marquis returns to his estate, which he has neglected for so long, only to find, to his horror, that he has been cheated by the manager he left in charge.At Wyn Castle he meets Flora Romilly, daughter of a distinguished author. She is known locally as the White Witch because she can heal ailments with plants and leaves from her herb garden and has worked wonders with his grandmother's rheumatism.At first, Flora despises the marquis, disgusted at the way his people have been treated in his absence. But once she is persuaded to help him make amends and put matters to rights on the estate, things begin to change.Unfortunately, fleeing London has not rid the marquis of Locadi and her evil magic—and she's coming for him.