The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
The Sea of Monsters
Percy Jackson and the Olympians (2)
The Mark of Athena
The Heroes of Olympus (4)
Legacy
Shannon Messenger
Keeper of the Lost Cities (8)
How to Cheat a Dragon's Curse
Cressida Cowell
How to Train Your Dragon (4)