Magnus Chase and the Gods of Asgard

Magnus Chase and the Gods of Asgard 4 Books Collection Set By Rick Riordan (The Sword of Summer, The Hammer of Thor, The Ship of the Dead & 9 From the Nine Worlds):

Magnus Chase and the Sword of Summer:
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.' Next thing I know, I'm reunited with my obnoxious uncle, who casually informs me that my long-lost father is a Norse god.

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.

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.

9 From the Nine Worlds:
Travel the Nine Worlds with your favourite characters from the world of Magnus Chase in a brand-new series of adventures.Find out why Amir Fadlan hates clothes shopping in Midgard, see how Mallory Keen learns in icy Niflheim that insulting a dragon can be a good idea, and join Alex Fierro as they play with fire (and a disco sword).