The Magnus Chase and the Gods of Asgard Series

The Magnus Chase and the Gods of Asgard Series Books 1 - 3 Collection Box Set by Rick Riordan:

Magnus Chase and the Sword of Summer:
The first book in the incredible new series from the author of Percy Jackson, the Kane Chronicles and Heroes of Olympus. My name is Magnus Chase. I'm orphaned and living rough on the streets of Boston. And things are about to get much worse. My day started out normally enough. I was sleeping under a bridge when some guy kicked me awake and said, 'They're after you'

Magnus Chase and the Hammer of Thor:
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.

Magnus Chase and the Ship of the Dead:
Loki the trickster god is free from his chains. Now he's readying Naglfar, the Ship of the Dead, armed with a host of giants and zombies, to sail against the Norse gods and begin the final battle of Ragnarok. It's up to Magnus Chase and his friends to stop Loki's plans. Along the way, they will face angry sea gods, hostile giants, and an evil fire-breathing dragon. But Magnus's biggest challenge will be facing his own inner demons.