Plot of Percy Jackson & the Olympians: Lightning thief
I don't have the bolt, I do not even have my helm.
Percy Jackson, a disabled troublemaker finds out that his father is a Greek god and he is a demigod. He goes to Camp Half-blood to seek refuge from monsters.
Percy finds out Zeus master-bolt has been stolen and he has been accused of stealing it for his father. He must go on a quest with Annabeth Chase and Grover Underwood to the the Underworld to prevent a war of the gods.
They travel far, battling many monsters till they reach Underworld in Hollywood and face Hades. And it turns out Hades does not have the bolt and his Helm of Darkness is missing, which he blames Percy of stealing.