Thirty-one nights. Thirty-one chapters. One final nightmare. Last Halloween, thirty trick-or-treaters vanished into the night. This October, they’re coming back—one by one, each day of the month. But every child carries the same chilling warning: something is returning on the 31st. Bob has never stopped searching for his daughter. Now, as the shadows of Halloween grow longer, he must face the darkness that stole her—before it takes everything again. The 31st Trick-or-Treater is a Halloween advent novel: thirty-one nights, thirty-one chapters, and one final nightmare waiting on Halloween.