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1
Jason wakes up on a school bus with no memory of who he is or how he got there. He is traveling with two strangers, Piper and Leo, who claim to be his friends. -
2
The three teens are attacked by storm spirits and saved by Annabeth Chase, a demigod from Camp Half-Blood. Annabeth tells them that they are all demigods too, children of the gods and mortal parents. -
3
The group makes their way to Camp Half-Blood, where they learn more about their powers and the dangers they face as demigods. Jason discovers that he is a son of Zeus, which makes him very important to the gods and monsters. -
4
Leo creates a dragon, Festus, which becomes their mode of transportation. They also learn that Hera, the queen of the gods, is missing, which has caused chaos in the world. -
5
Piper discovers that her father has been kidnapped by the giants, who are planning to overthrow the gods. She and the others set out on a quest to rescue him. -
6
The group encounters Boreas, the god of the north wind, who demands that they retrieve his stolen scepter in exchange for information about Piper's father. They succeed in retrieving the scepter but are attacked by giants. -
7
The group meets Aeolus, the god of winds, who helps them travel to the Grand Canyon to confront the giants. They discover that the giants are planning to use Piper's father to sacrifice to the earth mother, Gaea, in order to weaken the gods. -
8
They fight the giants and manage to defeat them with the help of Hera, who was disguised as a mortal. They rescue Piper's father and restore order to the world. -
9
The group returns to Camp Half-Blood, where they are greeted as heroes. They discover that they have been chosen by the gods to embark on a new quest, but they do not know what it is yet. -
10
Jason meets with Chiron, the centaur who runs Camp Half-Blood, and learns more about his past. He discovers that he has a sister named Thalia, who was also a demigod and a member of the famous group, the Hunters of Artemis. -
11
Piper receives a vision from her father, who tells her that he has been kidnapped again and that she must go to the ancient lands of the Cherokee to rescue him. -
12
The group sets out on their new quest and encounters many challenges along the way, including battling monsters and navigating treacherous terrain. -
13
They meet a boy named Dylan, who is revealed to be a servant of Gaea. Dylan tries to convince them to join her cause, but they refuse and defeat him in battle. -
14
The group arrives in the ancient lands of the Cherokee and discovers that Piper's father is being held captive by the giant, Enceladus. They battle the giant and manage to rescue him. -
15
The group learns that Gaea is awakening and that they must stop her before she destroys the world. They discover that they must travel to the ancient lands of Rome to find a way to defeat her. -
16
The group travels to Rome and meets Reyna, a demigod from Camp Jupiter. They also encounter the god Bacchus, who tells them that they must find the lost hero, Percy Jackson, if they are to have any hope of defeating Gaea. -
17
The group learns that Percy has been captured by the giant Polybotes and sets out to rescue him. They encounter many obstacles along the way but manage to defeat the giant and free Percy. -
18
The group returns to Camp Half-Blood, where they prepare for their final battle against Gaea. They join forces with the demigods from Camp Jupiter and together, they manage to defeat Gaea and save the world. -
19
The group is hailed as heroes and returns to their normal lives, but they know that they will always be demigods and that they will always face new challenges in the future. -
20
The book ends with the revelation that the prophecy of the seven has been fulfilled, but there is still more to come. The stage is set for the next book in the series, "The Heroes of Olympus: The Son of Neptune."