Your heart belongs to me by Dean Koontz

Ryan Perry has everything — wealth, success, and the love of his life — until a mysterious illness threatens it all. After receiving a heart transplant, he begins receiving unsettling messages from someone claiming to be the donor. As paranoia and fear take hold, Ryan must unravel the chilling mystery behind these messages before it consumes his life. Your Heart Belongs to Me is a suspenseful, emotionally charged thriller that blends Dean Koontz’s signature tension, psychological depth, and heart-stopping twists into an unforgettable story.