Graceling, by Kristen Cashore
I'm overjoyed that young adult novels about ass-kicking young women are a genre now, and Graceling is one of the best titles available. It's the first in a fantasy trilogy where rare people, called Gracelings, have some kind of special power. Teenage Katsa is a flawless assassin, and after years of being under the king's thumb she helps foment a rebellion. It's well done in every way, but what makes it stand out is how the protagonist handles love and lust, and practices consent and negotiation with the boy she's determined to not settle down with.