Thor’s hammer is missing again. The thunder god has a disturbing habit of misplacing his weapon – the mightiest force in the Nine Worlds. But this time the hammer isn’t just lost, it has fallen into enemy hands. If Magnus Chase and his friends can’t retrieve the hammer quickly, the mortal worlds will be defenseless against an onslaught of giants. Ragnarok will begin. The Nine Worlds will burn. Unfortunately, the only person who can broker a deal for the hammer’s return is the gods’ worst enemy, Loki and the price he wants is very high. About the AuthorRick Riordan is an award-winning mystery writer. Percy Jackson and the Lightning Thief, Rick’s first novel featuring the heroic young demigod, was the overall winner of the Red House Children’s Book Award in 2006 and is now a blockbuster film franchise, starring Logan Lerman. Rick lives in Boston with his wife and two sons.