Sometimes life isn’t fair for Mabel Chase. Like for instance she isn’t allowed to go Trick or Treating on Halloween because she has to visit a relative instead. And even though there’s a monster living under her bed, her parents still won’t let her have a brand-new high-up bunk bed which wouldn’t have any hiding spots for monsters. And no-one at school believes her when she spots aliens in the playground. But none of that matters in the end – because Mabel is still magnificent.