Little ghost Elli is in trouble: her uncle Chamberlain has been kidnapped by mysterious drones and the old haunted mansion where she used to live with him is no longer habitable. While searching for Chamberlain, she comes across an old ghost train at the fair, where an illustrious community of monsters lives: Yeti Martha, vampire Vangrufti and Knarf Frankenstein. When it comes to forging an adventurous plan to save the monsters, fight the nasty drones and free her uncle, Elli outgrows herself.