Trials of Apollo 4: The Tyrant's Tomb
Rick Riordan
The Trials of Apollo (4)
The Sun and the Star
Rick Riordan & Mark Oshiro
The Tower of Nero
The Trials of Apollo (5)
The Devils
Joe Abercrombie
Percy Jackson's Greek Gods
Rick Riordan & John Rocco
Percy Jackson's Companion Books (3)