The Mask by Dean Koontz

A mysterious girl materializes in Carol and Paul's lives, offering them the family they've always longed for. Yet beneath her angelic exterior lies something unsettling—a blank slate of a past that raises troubling questions. As Carol's maternal instincts deepen, so does her unease. What secrets does this enigmatic child conceal? A gripping psychological thriller that explores the darkness lurking behind perfect moments and the price of unconditional devotion.