The Lost Hero

They defeat Enceladus at Mount Diablo and rescue Piper's father, who was being held captive. Jason, Piper and Leo, with the Hunters of Artemis, travel to the Wolf House and defeats the forces of Gaea, saving Hera. They temporarily stall Gaea's plans, but were unable to completely destroy the ancient beings. Meanwhile, at camp, Leo creates plans for a ship that would sail to Greece, and the Hephaestus campers decide to undergo the project, appointing Leo as their new counselor. With part of his memory returned, Jason realizes that he is a son of Jupiter, a hero from a Roman counterpart camp to Camp Half-Blood called Camp Jupiter somewhere near San Francisco, California. Hera, known as Juno to the Romans, has switched him with the Greek hero Percy Jackson, who is now at the Roman camp with no memory of his previous life. Camp Half-Blood and Camp Jupiter always had a ruthless rivalry; whenever they came into contact, things never ended well.

Question: is percy jackson in the lost hero book
Answer: yes