Quick recap
Apollo and Meg carry Jason's body to Camp Jupiter, in the San Francisco area, helped along the way by Lavinia, a pink-haired girl, and by Hazel. At the Roman camp, Frank and Reyna lead as praetors, and Apollo has to learn what it means to be a hero. He is sent to find the tomb of Tarquin, the last king of Rome, and to free a soundless god held in Sutro Tower. Meanwhile, the two remaining emperors prepare to attack the camp with Greek fire. Apollo calls on the gods from Temple Hill, and the battle decides the camp's future.
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