Halloween is easily Luz's favourite holiday - Scary costumes, free candy, and a day where being weird is a good thing? What's not to love! As it begins to reach that time back on the Human Realm, however, she learns the Boiling Isles has not a holiday, but an irregular force of nature known as called 'Valeween', where the Witches and Demons of the Isles gather together, share food, and... Board up their houses and windows. Why is everyone so scared of this day? Why have the trees gone black? And why is Amity so on edge?