In the sixth laugh-out-loud adventure from BLUE PETER BOOK AWARD-shortlisted Marcus Sedgwick and Pete Williamson, Elf Girl and Raven Boy make their way to Creepy Caves for a final showdown with the Goblin King.

Marcus Sedgwick is a full time author. His first novel, FLOODLAND, won the BRANFORD BOASE AWARD FOR THE BEST DEBUT CHILDREN'S NOVEL OF 2000. Since then he has won the 2014 PRINTZ AWARD for MIDWINTERBLOOD, and his books have been shortlisted for the GUARDIAN CHILDREN'S FICTION PRIZE, the BLUE PETER BOOK AWARD, the COSTA BOOK AWARD, the CARNEGIE MEDAL and the EDGAR ALLAN POE AWARD. He lives near Cambridge. Find his website at www.marcussedgwick.com and follow him on Twitter @marcussedgwick Pete Williamson is an artist, illustrator and animation designer. Visit his website at http://www.petewilliamson.co.uk and like him on Facebook at https://www.facebook.com/pages/Pete-Williamson-Illustration/459975400719965.