In the course of their dangerous mission in the expanse of Alaska, teenagers save the God of death, Thanatos, and later Percy save the camp of the Romans from giant Polybot. There he finds new friends Frank and hazel, who are members of the great seven demigods who must save the world from the wrath of the Earth.
In the second book “The Son of Neptune” describes the events after the first series and this time they revolve around the main character of the last cycle, Percy Jackson, who gets amnesia in the Roman camp of demigods. Trinity gets a task to rescue from captivity Hera, Queen of the gods, later the salvation which the young heroes witness the resurrection of the giant Porphyrion and learn about the future plans of the Earth and of the existence of the Roman camp, where did Jason. The first book of the series called “The Lost Hero” tells about the first stage of a new war, but mainly about the first three characters of the Second Great Prophecy: Jason, received amnesia, Piper and Leo. The main enemy in the cycle is Gaia, the Earth goddess, who decided to Wake up to take revenge on the gods of Olympus and destroy the entire human civilization. In the new cycle, in contrast to the titanomachy, described in the first series, we will focus on re-gigantomachia - the revolt of the giants (sons of the goddess Gaia and Tartarus) against the gods of Olympus. The first book of the series tells about the events taking place a few months later from “The Last prophecy”. « The Heroes of Olympus» - the cycle of the heroic genre of teenage fantasy by American author Rick Riordan, a continuation of the series “Percy Jackson and the Olympians”.The continuation is based not only on Greek myths, but now on Roman, not mentioned in previous books.