Nicole Riley is now a prisoner of Hades in the Underworld. This happened because her mother Nemesis sent her on a quest to get revenge on Hades. For this quest Nemesis told her to go to the Underworld, find the sword of Hades, and return it to her. For what reason did Nemesis want Hades powerful sword? Why did her mother what revenge on Hades? These questions ran though Nicole's mind. Was it because something was going to happen in the future and her mother wanted to stop it or was her mother just going crazy? While in the Underworld Nicole meets Nico di Angelo for the first time after hearing about him at camp. Does Nicole have feelings for this Nico kid she just met?