Curse of the Exile — Janis Susan May

After an unhappy childhood and a cruelly broken romance, Angelina Barstow has found a kind of respectable life working as a librarian with her charming but womanizing father. In 1860 they come to the Scottish castle called Merlon Motte, where the owner and his much younger brother are sharply divided on the necessity of selling the place. An ancient sword is stuck into the ceiling of the Great Hall and family legend says it was put there by a long-ago exiled son, who promised to curse anyone who endangers the castle. Angelina regards this as just a charming family story until the prospective buyer is murdered, the Sword of the Exile driven through his heart. In spite of herself, Angelina has fallen in love, but though she loves one and sincerely likes the other she doesn't know which of the brothers is the murderer. She thinks things can get no worse, but then there is another, more shocking death when her father is found drowned and the prospective buyer's friend, the same man who tried to dishonor her years before, says he intends to make her his mistress by force if necessary. Two more long held secrets threaten Angelina and her beloved before the Curse of the Exile is finally lifted.