Maria, who loses her son in a tragic motor accident, becomes obsessed with the man who receives his heart. He is Gary, a businessman with marital problems. Following his earlier heart attack, his wife Tess has been having an affair with Alex, an unpleasant writer. When Gary is rejuvenated by his heart transplant, Tess returns to him. But when Maria traces Gary and turns up on his doorstep, believing that her son is somehow still alive in Gary's chest, things take a bloody turn.