"Dance of Death (Fear Street Sagas #8)" by R. L. Stine

After the bizarre deaths of her parents, Madeline never expects to feel happy again. Then she falls in love with Justin Fier, a handsome young doctor. She is warned away from Justin by a young man no one else sees and an old woman everyone thinks is crazy. They tell her Justin is a man driven by an evil quest that destroys any woman who dares to love him.

Is it too late? Can Madeline escape the curse of the Fears?