The Crown of Ptolemy
Rick Riordan
Demigods and Magicians (3)
The Battle of the Labyrinth
Percy Jackson and the Olympians (4)
How to Train Your Dragon
Cressida Cowell
How to Train Your Dragon (1)
The Lost Hero
The Heroes of Olympus (1)
The Demigod Diaries
The Heroes of Olympus (0)