Percy and Annabeth have just gotten out of Tartarus and have been reunited with their friends. The Seven are finally back together. As they get ready to take on Gaea in Greece they run into problems that could end the Seven before they've even finished.
Nico and Reyna are trying to get the Athena statue to Camp Half-Blood before a war breaks out between the Greeks, and the Romans.
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Percy Jackson is in charge of protecting Camp Half Blood from the evil Neverseen. With Hazel and the help of two elves, he expects an easy victory. When the attack goes wrong, he has to find a way to keep the evil away from Annabeth for as long as possible.