Green Darkness by Anya Seton
This unforgettable story of undying love combines mysticism, suspense, mystery, and romance into a web of good and evil that stretches from 16th-century England to the present day. Richard Marsdon marries a young American woman named Celia, brings her to live at his English estate, and all seems to be going well. But now Richard has become withdrawn, and Celia is constantly haunted by a vague dread. When she suffers a breakdown and wavers between life and death, a wise doctor realises that only by forcing Celia to relive her past can he enable her to escape her illness. Celia travels back 400 years in time to her past life as a beautiful but doomed servant. Through her eyes, we see the England of the Tudors, torn by religious strife, and experience all the pageantry, lustiness, and cruelty of the age. As in other historical romance titles by this author, the past comes alive in this flamboyant classic novel.