The Blood of Olympus
Rick Riordan
The Heroes of Olympus (5)
The Demigod Files
Percy Jackson and the Olympians (4.50)
How to Seize a Dragon's Jewel
Cressida Cowell
How to Train Your Dragon (10)
The Tyrant's Tomb
The Trials of Apollo (4)
The Red Pyramid
The Kane Chronicles (1)