Crown of oblivion
(Book)

In Lanoria, Outsiders, who don't have magic, are inferior to Enchanteds, who do. That's just a fact for Astrid, an Outsider who is indentured to pay off her family's debts. She serves as the surrogate for the princess-if Renya steps out of line, Astrid is the one who bears the punishment for it. But there is a way out: the life-or-death Race of Oblivion. First, racers are dosed with the drug Oblivion, which wipes their memories. Then, when they awake in the middle of nowhere, only cryptic clues-and a sheer will to live-will lead them through treacherous terrain full of opponents who wouldn't think twice about killing each other to get ahead. But what throws Astrid the most is what she never expected to encounter in this race. A familiar face she can't place. Secret powers she shouldn't have. And a confusing memory of the past that, if real, could mean the undoing of the entire social structure that has kept her a slave her entire life. Competing could mean death...but it could also mean freedom. -- from AMaozn.