Charlie's ghostly skills have been tested to the limit by the Spook School exams. But there's no time for a rest – Spookmaster has an urgent mission for him.
An invisible ghost is haunting a hotel down on Earth, emitting the most terrible smells and forcing the guests to leave. And worse – it's conjured up a terrifying swarm of furry claws. Can Charlie and his friend Lewis sniff out the truth and discover why the ghost is creating such a stink?