the Trials of Apollo
The Trials of Apollo (10+ - tween) by Rick Riordan
The Hidden Oracle (Book 1)
The Dark Prophecy (Book 2)
The Burning Maze (Book 3)
The Tyrant’s Tomb(Book 4) Summoning help from the Roman Legion.
The Tower of Nero (Book 5) The long awaited conclusion does not disappoint. With many great characters coming to help out.