Percy Jackson and Annabeth Chase are 18 years old, and have just finished the war with Gaea. They're planning on going to college in New Rome - but things don't go exactly as planned. When Hecate offers them the opportunity of a lifetime, their worlds turn upside down. Harry Potter thought he would get to settle down after the war with Voldemort with his girlfriend and best friends - and what better way to do that is to complete his education at Hogwarts? But when two new students arrive, Harry knows that he's not going to have the peaceful year he wished for.