What if the dirt and grime that appears in our homes was actually put there by goblins?
What if those goblins filled our homes with dirt that could only be removed with one cleaning product – a detergent that was poisonous to the sea?
Twin sisters Georgie and Gem are the only ones who know about black magician Zachary Zigstack’s evil scheme to make his toxic detergent a world bestseller. Luckily the twins have a magical skill – they can leave their bodies and fly around in spirit form – which means they can spy on Zigstack’s goblin accomplices and find a way to stop them.
But can they do it before all the sea creatures are destroyed? The Slapstyx Goblins are dangerous as well as dirty, and have nasty ways of killing people who cross them…