Casey hates their surname, and they don’t even like Christmas – all the singing, silliness, and sparkles. Casey likes reading science books and nature rambles and sensible stuff like that. So, when an elf appears in the school library looking for help to save their boss, Santa, Casey thinks it must be a hallucination – surely the biggest encyclopaedia has fallen off the shelf and knocked them unconscious. But soon, it becomes clear it isn’t a dream, and Casey finds themself on an adventure of a lifetime involving a corporate American who wants to take over Christmas, a mad genetic scientist, a petulant talking penguin, unicorns, dinosaurs and of course, Santa Claus.