It's been almost twenty years since the battle with Gaea. Percy Jackson is happily married to the love of his life, Annabeth. The two are happy raising their two children, sixteen year old Aria and ten year old Toby. One night, four demigods show up at Percy and Annabeth's front door, saying that they've been sent here by some of Percy and Annabeth's friends. Together they use Percy and Annabeth's help to find answers and why they are in danger.