Valiant (The Modern Faerie Tales, #2)

Valiant (The Modern Faerie Tales, #2) - Holly Black I didn't like this one quite as much as Tithe. Though it seems more of a standalone, there are a few characters from Faery from the first one that are mentioned later on here. Apparently, Ironside, the third book in the series, is more of a direct sequel to Tithe.

When seventeen-year-old Val finds her mom and her boyfriend making out, she runs away from her home in New Jersey to the streets of New York City. She befriends a group of kids who live in the subway tunnels where she encounters some strange substances, and meets some even stranger people, including Ravus the Troll. She agrees to help him with deliveries since he cannot go out in the sun, while he teaches her sword fighting in return. She grows to admire him and when he's accused of poisoning the other exiled faeries, she vows to help him in any way she can and everything ends happily ever after (sorta). Just like a true fairy tale. LOL