The Trials of Apollo Tome 2 - The Dark Prophecy

The god Apollo, cast down to earth and trapped in the form of a gawky teenage boy as punishment, must set off on the second of his harrowing (and hilarious) trials. He and his companions seek the ancient oracles, and restoring them is the only way for Apollo to reclaim his place on Mount Olympus—but this is easier said than done. Standing in Apollo's way is the second member of the evil Triumvirate—a Roman emperor with a love of bloodshed and spectacle. To survive the encounter, Apollo will need the help of a now-mortal goddess, a bronze dragon, and some familiar demigod faces from Camp Half-Blood. With them by his side, can Apollo face down the greatest challenge of his four thousand years of existence?