The Hidden Oracle
Rick Riordan
The Trials of Apollo (1)
The Demigod Files
Percy Jackson and the Olympians (4.5)
Camp Half-Blood Confidential: Your Real Guide to the Demigod ...
How to Ride a Dragon's Storm
Cressida Cowell
How to Train Your Dragon (7)
The Demigod Diaries
The Heroes of Olympus (0)