The Dark Prophecy (The Trials of Apollo Book 2) 

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.