The Lightning Thief
Chiron tells Percy to find Zeus' master lightning bolt. Chiron thinks Hades stole the bolt. However, Zeus discovers that Poseidon has broken his oath, and thinks Poseidon told Percy to steal the bolt. He tells Percy that he has ten days until the summer solstice to find it. Before leaving, Luke gives Percy magic shoes. Percy gives them to Grover. Annabeth (a daughter of Athena) and Grover join Percy in his quest to find the bolt.