The Hidden Oracle
Rick Riordan
The Trials of Apollo (1)
How to Speak Dragonese
Cressida Cowell
How to Train Your Dragon (3)
Keeper of the Lost Cities
Shannon Messenger
Keeper of the Lost Cities (1)
The Titan's Curse
Percy Jackson and the Olympians (3)
Exile
Keeper of the Lost Cities (2)
Everblaze
Keeper of the Lost Cities (3)
Neverseen
Keeper of the Lost Cities (4)
Lodestar
Keeper of the Lost Cities (5)
Nightfall
Keeper of the Lost Cities (6)
Flashback
Keeper of the Lost Cities (7)
Legacy
Keeper of the Lost Cities (8)
Unlocked
Keeper of the Lost Cities (8.5)
Stellarlune
Keeper of the Lost Cities (9)
Unraveled
Keeper of the Lost Cities (9.5)