"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...

When apprentice librarian Elisabeth is implicated in sabotage that released the library's most dangerous grimoire, she becomes entangled in a centuries-old conspiracy that could mean the end of everything. "All sorcerers are evil. Elisabeth has known that as long as she has known anything. Raised as a foundling in one of Austermeer's Great Libraries, Elisabeth has grown up among the tools of sorcery--magical grimoires that whisper on shelves and...