The Burning Maze (The Trials of Apollo Book 3)

The third book in the latest series from international bestselling author, Rick Riordan. He was a god once, until he was cast out by his father, Zeus. Now, he's an awkward teenager called Lester. The only way out is a series of scary and dangerous trials, of course. For his third trial, Apollo must journey through the Labyrinth to free an Oracle who only speaks in puzzles. Then, he must defeat the most vicious of three very vicious Roman Emperors, all without the use of his godly powers. It looks like he will need all the help he can get from some new and old friends.

More books by Rick Riordan:
The Percy Jackson series:
Percy Jackson and the Lightning Thief
Percy Jackson and the Sea of Monsters
Percy Jackson and the Titan's Curse
Percy Jackson and the Battle of the Labyrinth
Percy Jackson and the Last Olympian
Percy Jackson: The Demigod Files

The Heroes of Olympus series:
The Lost Hero
The Son of Neptune
The Mark of Athena
The Heroes of Olympus: The Demigod Files

The Kane Chronicles series:
The Red Pyramid
The Throne of Fire
The Serpent's Shadow

The Magnus Chase series:
Magnus Chase and the Sword of Summer
Magnus Chase and the Hammer of Thor
Magnus Chase and the Ship of the Dead.