Percy is at a feld trip at a mussium and fights his math techer who ends up as a demon. His History teacher gives him a pen which ends up being a sord and he kills the demond.
Percy leaves his school and gets chased by a minatore who takes his mom away from him. He kills the minotare. he finds out that his dad that left him was posiden the god of water. His best freand Grover ends up beeing a star so he is hafe goate and have human and his teacher is hafe human and hafe horce.
Percy sets out on a quest when he finds out thet Zeus lightning bolt is missing. Percy, Grover, and a strong fighter named Anabbith go out to tell hades thet Percy douse not have the bolt and let my mom go. On the way Percy and his freands have to fight mudusa and outher monsters along the way to the underworld.
When they get to the underworld to confrount Hades. They find out that they had the Lightning Bolt the entier time. They step on 3 pearls and exape the under world almost ding. Percys mom said they should leave her behind.
They get to mountolipous and Percy retens the bolt to Zeus who calls off war at the last second. Zeus leaves and it leaves Posidon and Percy. They have a talk. Posidon said that Percys mom was a queen and that he wished that he could stay with her and not leave but that would be agenst the
Percy finds out that luke a frend of his from camp put the bolt in percys bag so hades could get it.. Luke wanted the god to kill eachother because he hted them. He fought Percy and posond him with a scorpin. Percy was heald but Luke got away. When Percy got home he found his mom and he was happy