After spending months apart, finally demigods Percy and Annabeth are reunited, along with their friends - Frank, Hazel, Jason, Piper and Leo. Seven heroes bound together by a terrifying prophecy that threatens them all.

Now the heroes must work together to retrieve the Athena Parthenos - a sacred statue of the Greek goddess - only, it's closely guarded by an old enemy. Failure though means putting all of humanity at risk.

They've already saved the world once... twice shouldn't be a problem, right?