 Based on a rumor that the humans are currently involved in something strange (hanging wreaths on their doors and lights on their eaves), the four trolls devise a plan to trick Bu into venturing to "People-land", in the hopes that he will get killed by humans while investigating.They tell Bu that the humans may be planning an invasion of the Troll Kingdom, and that as prince it is his duty to investigate.While Bu is at first hesitant (believing the expedition to be a trick and fearing the humans), he is inspired by the thought that uncovering the humans' plot will make his father proud.