The Burning Maze
Rick Riordan
The Trials of Apollo (3)
The Tower of Nero
The Trials of Apollo (5)
9 from the Nine Worlds
Magnus Chase and the Gods of Asgard (5)
How to Train Your Viking
Cressida Cowell
How to Train Your Dragon (1.5)
The Last Olympian
Percy Jackson and the Olympians (5)