Stormy is an orphan & a kitchen skivvy. He tends the compost he scrubs the floors & watches feasts make their way up the mountain as he survives on bread & water. A skivvy is all that Stormy can hope to be. But Stormy has a secret. He wants to be a sky-rider to soar amongst the clouds on spitfyres: flying horses that spit fire & smoke & answer only to their riders. A chance meeting with an escaped convict turns Stormy's life upside down. Sent up to the Academy he uncovers a web of lies deceits & neglect at the centre of which lies the mysterious thirteenth horse. Can Stormy save Thirteen defeat the dark forces at work within the Academy & prove himself worthy as a sky-rider?