Tells the story about a kid who thinks he is just a ordinary kid that's nothing but trouble in which he actually is Poseidon's son. So he soon realizes that he is a Demigod (half blood,half god,half human),after a bunch of crazy events and him attending Camp Halfblood that he is the son of Poseidon. Camp Halfblood is for Demigods just like Percy, and they protect him from monsters trying to kill him in the real world. There he gets trained to become a hero and very powerful so he can defend himself and protect himself for his quest. Zeus accuses Poseidon of stealing his lightning bolt which creates lightning. The quest was for finding the master bolt and giving it back to Zeus before midnight in the summers solstice to prevent war breaking