The Evil Seed
Joanne Harris1992

It's never easy to face the fact that a man you once loved passionately has found the girl of his dreams, as Alice discovers when Joe introduces her to his new girlfriend. Then Alice finds an old diary and reads about two men and the mysterious woman who bewitched them both, buried in Grantchester churchyard half a century ago.

As the stories seem to intertwine, Alice comes to realize that her instinctive hatred of Joe's new girlfriend may not just be due to jealousy, as she is plunged into a nightmare world of obsession, revenge, seduction - and blood.