This song I'll never forget, Mary Higgins Clark

A haunting melody plays over and over in Kay's mind. Where does it come from? What does it mean? Why is it obsessing her so much?
Delving into her memories, the young woman recalls a somewhat blurry scene from her childhood, in the Carrington estate where she grew up. Since then, Kay has married Peter, the family heir. But suspicions hang over her husband regarding the disappearance of a young girl and the accidental death of his ex-wife, found drowned in the pool; Peter is imprisoned... Convinced of his innocence, Kay embarks on the trail of this music, unaware that it harbors a very dangerous secret – for her, and for him.