It's two days before the Sloe Fair in Chichester, and all is not well. Smelly ghosts have sailed into the marina on a haunted ship, and Cathy and Peter are missing. Button and Stitchley, the intrepid spiders from North Street, are on the case. This time, they're helped by Purrcasso, the cat from the art gallery, and Sparkle and Topaz, the budgies from South Street. But there's no time to lose. Now that the terrifying thunderstorm has passed, it's time to catch the ghost train before the fair leaves town.