Jason, Piper, and Leo are at the Grand canyon when a group of spirits attack called storm spirits. This is when they discover there gym teacher(Coach Gleeson Hedge) is half goat and he jumps in to save the from the storm spirits which causes them to kidnap him.
Jason, Piper, and Leo are all taken to Camp half blood. This is where they discover their godly parents and their godly like abilities.
When our three heros are at cmap half blood is when internal conflict begins to show up. You have Leo who is just realizing that he killed his mom, and then you have jason that has amensia and all the sudden has a vision of the goddess hera being captured, and Piper is imaging her own father being kidnapped by a giant.
In this part of the story Leo is told in the Hephaestus camp about a metal dragon that goes haywire and attacks the camp, ever since the the man who rebuilt it (Charles Beckendorf) died it has not been the same.
Jason at this time still does not remember much, but is starting to fragments of his memory back in form of visions, and dreams. He then wakes up in the zeus cabin and pictures of this girl and Annabeth.
Now Jason, Leo, and Piper set off on a quest to save hera and kill the earth goddess Gaea