Hotel Valhalla Guide to the Norse Worlds: Your Introduction ...
Rick Riordan
Magnus Chase and the Gods of Asgard (4)
The Wyrm King
Tony DiTerlizzi & Holly Black
Fire Star
Chris D'Lacey
The House of Hades
The Heroes of Olympus (1)
The Burning Maze
The Trials of Apollo (3)
Percy Jackson's Greek Gods
Rick Riordan & John Rocco
The Son of Neptune
The Heroes of Olympus (2)