Answer:
Chiron helps Percy and Grover figure out that they must travel to Hades in order to recover the master bolt. Hades is the god who has turned against his brothers, Zeus and Poseidon. Hades must have had someone steal the master bolt for him so that Zeus and Poseidon would wage war on one another.
Hades is the god of the Underworld, which means that Percy and Grover have a ticket to Worm City.
The page is somewhere in chapter 9. Sorry not much help.
Step-by-step explanation: