Sam and her Dad live alone, twenty-five levels below earth. Seeking a better life, Dad travels to Callisto Four to open a cafe.

What can go wrong on a camping holiday on Callisto? It's the nicest planet in the universe. Or was until Sam and Cherry are kidnapped by evil space pirates. They are being held to ransom in return for the fabulous treasure known as the Golden Queen. Will they be exchanged in time-or sold in the slave markets of Zanderban? A fantastic intergalactic adventure featuring space travel, rocket ships, nasty pirates and their two-headed dog.

Sam and Broc save the planet Callisto when the vegetation comes under attack from a plague of mutant vampire slugs.