Percy is a young half blood who's in danger by monsters who think that he took Zeus's master bolt.
Someone stole Zeus's master bolt and Zeus is blaming Poseidon for it and when Poseidon claims Percy as his son Zeus blames Percy.
Percy and his friends Annabeth and Grover Lose all their stuff from being attacked by Mrs Dodds and her fury's and become suspects and are wanted to be questioned
Percy and his friends get in a trap and it's hard to resist because your constantly playing a video game and days feel like hours.
Percy and his friends make it to the underworld to ask Hades for the master bolt but Hades doesn't have it. Then Hades asks Percy to give him the master bolt. Then Percy and his friends escape after telling Hades that they will reclaim his throne for him.
Percy makes it to Olympus and returns Zeus's master bolt. Then Percy has a chance to talk to his father Poseidon