In the end of The Lightning thief by Rick Riordan Percy realized that Hades was not the one who stole the lightning bolt instead it was the god Aries. But he was being controlled by the titan Kronos. But he was able to defeat Aries and obtain the lightning bolt and Hades helmet. He also got his mom back for obtaining the helmet of Hades, and his dads love. But something was still bothering him and it was that his friend Luke betrayed him and tried to kill him and destroy the gods.