The Sword of Summer
Rick Riordan
Magnus Chase and the Gods of Asgard (1)
The Lost Hero
The Heroes of Olympus (1)
9 from the Nine Worlds
Magnus Chase and the Gods of Asgard (5)
The Mark of Athena
The Heroes of Olympus (4)
How to Speak Dragonese
Cressida Cowell
How to Train Your Dragon (3)
How to Break a Dragon's Heart
How to Train Your Dragon (8)
How to Seize a Dragon's Jewel
How to Train Your Dragon (10)
How To Train Your Dragon: How to Betray a Dragon's Hero: Book ...
How to Train Your Dragon (11)