Harley Hitch returns for an airborne adventure in this highly illustrated fiction series about a determined young inventor from award-winning author Vashti Hardy. The Aviation Parade is coming to Forgetown this summer, and Harley has her sights set on creating a flying machine that will really stand out: a robot hippogriff! And if the creature impresses Cosmo's mum enough, surely Cosmo will be able to keep it as a pet? But Harley wants the flying machine to be a surprise for everyone. She soon finds that keeping secrets leads to tricky explanations and lots of trouble - especially when REAL hippogriffs arrive and cause chaos! Join Harley, her robot dog Sprocket and best friend Cosmo for problem-solving adventures and mysteries in a world where science rules and technology grows in the forest! A rollicking adventure that celebrates STEM learning! Highly illustrated with lively, humourous illustrations by George Ermos. Vashti Hardy is an award-winning author of children's books. Her novel Wildspark won the Blue Peter Book Award for Best Story 2020, and Brightstorm was shortlisted for the Waterstones Children's Book Prize 2019.