Unfinished Tales
J. R. R. Tolkien
The Demigod Files
Rick Riordan
Percy Jackson and the Olympians (4.5)
The House of Hades
The Heroes of Olympus (1)
The Legend of Sigurd and Gudrún
How to Cheat a Dragon's Curse
Cressida Cowell
How to Train Your Dragon (4)
How to Speak Dragonese
How to Train Your Dragon (3)