The Dark Prophecy: The Trials of Apollo Book 2

Published by Penguin Random House Children's UK.

The second book in the latest series from international bestselling author, Rick Riordan.
He was once an immortal God, now he's an awkward teenager. Things aren't going well for Apollo.
There's only one way he can earn back Zeus' favour, and that's to seek and restore the ancient oracles - but that's easier said than done.
Apollo must head to the American Midwest where, rumour has it, a haunted cave may hold answers.
There are a few things standing in his way though. The cave could kill him, or drive him insane.
Oh, and a Roman Emperor, whose love of bloodshed makes Nero look tame.

To stay alive, Apollo needs the help of a mortal goddess, a bronze dragon, and some familiar faces from Camp Half-Blood.
Will he survive the greatest challenge of his four thousand year existence?
__________

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