Magnus Chase and the gods of Asgard

"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."--Amazon.

After Loki escapes, he gathers an army to begin the final battle against the Asgardians. Magnus Chase and his motley group of friends attempt to stop Loki before he can board the "Naglfar," the Ship of the Dead, and launch the Ragnarok, but first they must sail across the oceans of Midgard, Jotunheim, and Niflheim, facing down all manner of beasts and threats before they can even begin to try and outwit Loki.

"Magnus Chase has always been a troubled kid. Since his mother's mysterious death, he's lived alone on the streets of Boston, surviving by his wits, keeping one step ahead of the police and the truant officers. One day, he's tracked down by an uncle he barely knows-a man his mother claimed was dangerous. Uncle Randolph tells him an impossible secret: Magnus is the son of a Norse god. The Viking myths are true. The gods of Asgard are preparing for war. Trolls, giants and worse monsters are stirring for doomsday. To prevent Ragnarok, Magnus must search the Nine Worlds for a weapon that has been lost for thousands of years. When an attack by fire giants forces him to choose between his own safety and the lives of hundreds of innocents, Magnus makes a fatal decision. Sometimes, the only way to start a new life is to die ..."--Publisher.

"Magnus and his friends set sail for the farthest borders of Jotunheim and Niflheim in pursuit of Asgard's greatest threat, Loki's demonic ship full of zombies"--Provided by publisher.