How to Train Your Viking
Cressida Cowell
How to Train Your Dragon (1.5)
How to Cheat a Dragon's Curse
How to Train Your Dragon (4)
The Crown of Ptolemy
Rick Riordan
Demigods and Magicians (3)
The Ship of the Dead
Magnus Chase and the Gods of Asgard (3)
The Titan's Curse
Percy Jackson and the Olympians (3)