The seven are all grown up now, and they have kids. Pearl Jackson, daughter of Annabeth and Percy, has disappeared. How will they find her? Can Parker Jackson, Jared Grace, and the rest of The Seven's kid's find Pearl and return her to her loved ones?

Annabeth has died in the battle at Camp Half-Blood, and Percy has abandoned the godly world. Percy wants to avenge her death, but will he be able to face his fears and go back?

Before the Hero's of Olympus began their quest, there was another group of seven demigods that set out to save the world.