The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
They Both Die at the End
Adam Silvera
Plutarch's Lives, Volume 1 (of 4)
Plutarch
Percy Jackson's Greek Gods
Rick Riordan & John Rocco
Percy Jackson's Companion Books (3)
Isles of the Emberdark
Brandon Sanderson