The Unknown Child (Percy Jackson FanFic)

This story will take place during the Mark of Athena but it will not exactly be the same, it at all.
Ashline was on her way to L.A. to visit Hades for her 15th birthday, but was captured on her way. She was kept in Tartus for a month and nearly went insane. She heard of another demigod trapped here from the Giants but never saw them. She's now stuck Rome in a hole with an antisocial boy who reminds her of her favorite God of the Underworld. So now she's waiting for her chance to escape the hole, but without any of her powers working right how can she get out? Will she help Nico and the other demigods defeat Gaea?

Nico was in the underworld on his way to investigate the Doors of Death and how to close them. But somewhere along the way he was captured. For awhile he was in Tartus, hearing of another demigod being held there. One who if killed, would anger all of the Gods. But Nico never sees this other demigod. Nico is later moved into a giant, deep hole in what he guesses if in Rome. After a couple of weeks stuck there, in comes another. A girl with long black hair and dark blue eyes that seem to have little flecks of silver in them. Undoubtedly she is very beautiful, but she is also very quiet. She is also obviously a demigod and he wonders if she I the one that the Giants were talking about. And if so would she help defeat Gaea..?