In his penultimate adventure, a devastated but determined Apollo travels to Camp Jupiter, where he must learn what it is to be a hero, or die trying.

It's not easy being Apollo, especially when you've been turned into a human and banished from Olympus. On his path to restoring five ancient oracles and reclaiming his godly powers, Apollo (aka Lester Papadopoulos) has faced both triumphs and tragedies. Now his journey takes him to Camp Jupiter in the San Francisco Bay Area, where the Roman demigods are preparing for a desperate last stand against the evil Triumvirate of Roman emperors. Hazel, Reyna, Frank, Tyson, Ella, and many other old friends will need Apollo's aid to survive the onslaught. Unfortunately, the answer to their salvation lies in the forgotten tomb of a Roman ruler . . . someone even worse than the emperors Apollo has already faced.

Time to discover what's been going on at Camp Jupiter . . .

It's the February after Gaea's defeat. Camp Jupiter, like everyone else, should be celebrating.

But something is causing chaos.

Mysterious, sinister incidents are wreaking havoc throughout the camp. Tensions are high, and suspicion quickly falls on Claudia, the Fourth Cohort's newest probatio. After all, the mischief started shortly after she stumbled into camp.

To find out the truth, delve into the pages of Claudia's personal journal. Through her eyewitness accounts, you'll visit the crime scenes - a row of seats in the coliseum, an underground aqueduct tunnel - and see the bizarre events unfold . . .

And you'll be right alongside Claudia when she discovers an ancient secret that may hold the key to Camp Jupiter's safety.

At last, the breathtaking, action-packed finale of the #1 bestselling Trials of Apollo series is here! Will the Greek god Apollo, cast down to earth in the pathetic moral form of a teenager named Lester Papadopoulos, finally regain his place on Mount Olympus? Lester's demigod friends at Camp Jupiter just helped him survive attacks from bloodthirsty ghouls, an evil Roman king and his army of the undead, and the lethal emperors Caligula and Commodus. Now the former god and his demigod master Meg must follow a prophecy uncovered by Ella the harpy. Lester's final challenge will be at the Tower of Nero, back in New York. Will Meg have a last showdown with her father? Will this helpless form of Apollo have to face his arch nemesis, Python? Who will be on hand at Camp Half-Blood to assist? These questions and more will be answered in this book that all demigods are eagerly awaiting.