Will the Greek god Apollo ever reclaim his rightful place atop Mount Olympus after being banished to the planet in the pitiful earthly shape of a teenager named Lester Papadopoulos? Lester has recently escaped attacks by bloodthirsty ghouls, a wicked Roman ruler and his army of the undead, and the deadly emperors Caligula and Commodus thanks to his demigod friends at Camp Jupiter. The former god and his demigod mistress Meg must now carry out a prophecy that Ella the harpy discovered. Back in New York, at the Tower of Nero, will be Lester's ultimate test.