The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
Unlocked
Shannon Messenger
Keeper of the Lost Cities (8.5)
The Lost Hero
The Heroes of Olympus (1)
How to Ride a Dragon's Storm
Cressida Cowell
How to Train Your Dragon (7)
The Lightning Thief
Percy Jackson and the Olympians (1)
The Sea of Monsters
Percy Jackson and the Olympians (2)
The Titan's Curse
Percy Jackson and the Olympians (3)
The Last Olympian
Percy Jackson and the Olympians (5)