The seven demigods continue to hold back the awakening of the evil goddess Gaia. The once powerful team is now divided, with the five heroes flying to Greece, while Percy and Annabeth fly to… Tartarus. Fans of the "classics", i.e. Percy Jackson's solo series, will be greatly surprised by this part and will make them reconsider their attitude to many events of the past. Well, those who adore the "new" demigods will have an opportunity to rejoice for Leo Valdez.