Ellie is invited to a Halloween sleepover at her best friend Hannah's house. She can't wait to have some spooky fun with her friends ... until the lights go out. Nothing scares Ellie worse than the dark! But when the villainous Fairy Frightmare strikes the sleepover and sprinkles the girls with bad dream dust ― trapping them inside their worst nightmares ― there are bigger things to worry about. Can Ellie squash her fear and save her friends?