The Last Olympian
Rick Riordan
Percy Jackson and the Olympians (5)
Wrath of the Triple Goddess
Percy Jackson and the Olympians (7)
The Mark of Athena
The Heroes of Olympus (4)
How to Train Your Viking
Cressida Cowell
How to Train Your Dragon (1.50)
Hero's Guide to Deadly Dragons
How to Train Your Dragon (6)