The group is tricked by Ares, escapes the Lotus Casino, and continues to the Underworld. Part 4: Into the Underworld (Chapters 17-20)
After a dangerous encounter at the Gateway Arch, Percy escapes into the Mississippi River. The group is tricked by Ares, escapes the
Percy obtains magical pearls and gets past Cerberus, finding Hades' realm. The group is tricked by Ares
Percy learns Chiron is his trainer, discovers his water-based powers, and makes friends like Annabeth. escapes the Lotus Casino