What really happened on Hilo's world before he came to Earth? D.J. and our favourite space boy, Hilo, take a DANGEROUS trip to Hilo's home planet to find out!Everything Hilo thinks he knows about his past is about to be turned inside out and UPSIDE DOWN! He was supposed to save everyone . . . but what happens if it's Hilo that needs saving?!Is ANYONE who we think they are? Can Hilo and his friends figure it all out before it's too late?!The fifth book in the action-packed, laugh-out loud bestselling graphic novel series perfect for young readers aged 9-11.