Graceling by Kristin Cashore

Rageful, exhilarating, wistful in turns" (New York Times Book Review) with “a knee weakening romance” (Los Angeles Times). Graceling is a thrilling, action-packed fantasy adventure that will resonate deeply with anyone trying to find their way in the world.
Graceling tells the story of the vulnerable-yet-strong Katsa, who is smart and beautiful and lives in the Seven Kingdoms where selected people are born with a Grace, a special talent that can be anything at all. Katsa’s Grace is killing.