We meet Henry - a creative, delightful boy who would very much like to be an elf. When the Halloween season begins, he throws himself into preparation, for this year he will get to try on his elf-ness! He also meets Brie, a classmate who invites him to trick-or-treat in her neighborhood. On Halloween eve they immediately see that this is no ordinary Halloween: Henry-the-Elf and Brie-the-Cat discover a "Story House," and the adventure begins.