Martin Moone is eleven and completely fed up with being the only boy in a family of girls. He's desperate for a decent wingman to help him navigate his idiotic life. So when best mate Padraic suggests Martin get an imaginary friend―or "IF" for short―he decides to give it a go. His first attempt is Loopy Lou, a hyperactive goofball who loves writing rubbish rap songs. But Martin soon gets fed up with Lou's loopiness and decides to trade in his IF for someone a little less wacky. Enter Sean "Caution" Murphy, an imaginary office clerk in a bad suit with a passion for laziness and a head full of dodgy jokes. Sean is full of tips and tricks to guide Martin through the perils of the playground, from dealing with his sisters' pranks to besting the bullying Bonner boys. But getting rid of Lou is not that easy, and having TWO imaginary friends is a recipe for trouble!

MARTIN MOONE AND HIS IMAGINARY FRIEND SEAN MURPHY ARE BACK! THE LAUGHS ARE BIGGER AND THE ADVENTURES SILLIER. It’s lean times at the Moone Boy household and all Martin wants is a Game Boy. If he wants a Game Boy though, he’s going to have to work for it. So his imaginary friend, Sean, suggests he get a job… After failing to find work as a stable boy, cowboy, or homeboy, the Moone boy instead becomes Boyle’s main butcher boy. But Francie Feeley’s Fabulous Fishatorium across the road is luring all their customers away. Convinced something fishy is afoot, Martin and Sean decide to go on an undercover mission to discover the secrets of the mysterious fish factory. But can Agent M double-O N E get to the bottom of Feeley’s slippery schemes without ending up sleeping with the fishes himself?

Martin Moone is about to finish primary school and feels he hasn’t achieved very much. He’s desperate to get his picture on the school’s Winners' Wall and decides that entering the Invention Convention science competition will definitely earn him everlasting respect. But Martin - along with his teammates Trevor, Padraic and the ever terrifying Declan Mannion - is having trouble coming up with a winning idea. Martin’s imaginary friend, Sean, comes to the rescue, and together they concoct a plan to beat the snooty kids from the posh school in town. If they can get their hands on some Notion Potion, a mythical brain-boosting beverage, then Martin will have all the ideas he needs. And so the gang embarks on a dangerous (imaginary) journey in their quest to become 'Boyle’s first Junior Genius'.The Notion Potion is the hilarious third book in the Moone Boy series, based on the Sky TV series from dream team Chris O'Dowd and Nick Vincent Murphy

Do you want your own bobble hat and your own imaginary friend—just like Martin Moone? Then join Martin and his friend Sean Murphy in the marvelous world of Moone Boy ! Enjoy an exclusive new Moone Boy story, a comic strip adventure, plenty of jokes and a bumper crop of activities and games, including Imaginary Friend top trumps, learn to draw Martin Moone and many more. Featuring all of Martin's friends (and enemies) and packed with advice on finding your own Imaginary Friend (IF), this manual is the ultimate companion for fans of the series.