Luke and his brother have swapped bodies by accident. Zack's got Luke's weird feet while Luke has Zack's SUPERPOWERS! Now he needs another world-threatening adventure to try them out. Could a family mini-break at Great Minds Leisure Park be his chance? Probably, because that's where his super-clever arch-enemy lurks, fermenting dastardly plans and bubbling gently... My Arch-Enemy Is a Brain In a Jar is the fourth instalment of Luke's laugh-out-loud adventures. From the author of My Brother Is a Superhero, winner of the Waterstones Children's Book Prize and the British Book Industry Awards Children's Book of the Year, and My Gym Teacher Is an Alien Overlord, winner of a Lollies Laugh Out Loud 2017 Book Award. Books don't come much funnier than these! Packed with heart and soul, this series is perfect for fans of David Baddiel and David Walliams. My Brother Is a Superhero My Gym Teacher is an Alien Overlord My Evil Twin is a Supervillain My Arch-Enemy is a Brain in a Jar My Cousin is a Time-Traveller