1. On the way there, they are attacked by the Minotaur, which grabs Percy's mother by her throat. She then dissolves into a golden shower of light. Percy was angered with the Minotaur for thinking that it killed his mother. Then Percy goes after the Minotaur and defeats him using the Minotaur's own horn. 2. Percy then stumbles into the camp semi-conscious carried by Grover. He learns that he is a half-blood: half-human, half-god. At camp, Percy learns more information about himself and especially his father Poseidon, God of the Sea and brother to Zeus and Hades. 3. When Zeus's master bolt is stolen, Poseidon is blamed for the theft. Zeus tells Poseidon that the master bolt must be returned to Mount Olympus by the summer solstice, or else he will declare war on Poseidon. Poseidon is surprised that his brother Zeus would even accuse him of such a thing. 4. Percy sets out on a quest to retrieve Zeus's master bolt, which is believed to be in Hades' captivity in the Underworld. Percy has to travel west to reach the entrance to the Underworld in Hollywood. His best friend, Grover with Annabeth, a demigoddess, and daughter of Athena decided to go along with Percy. 5. The three take a bus, a train, a truck, and a taxi cab to make their way across America, from New York to Los Angeles, where the gates of the Underworld are located. They stop in St. Louis, Denver, and Las Vegas along the way.
6. They find a disaster on the observation deck of the Gateway Arch, they are tricked by the god of war (Ares), they nearly lose their memories in an enchanted Vegas casino, and they are almost stretched to death.
7. They encounter Greek monsters, including the Furies, Medusa, Echidna, the