Kristin Cashore has created a stunning fantasy world for us in her two recent books; Graceling and Fire. 

Graceling takes readers inside the world of Katsa, a warrior-girl in her late teens with one blue eye and one green eye. This gives her haunting beauty, but also marks her as a Graceling. Gracelings are beings with special talents—swimming, storytelling, dancing. Katsa's Grace is considered more useful: her ability to fight (and kill, if she wanted to) is unequaled in the seven kingdoms. Forced to act as a henchman for a manipulative king, Katsa channels her guilt by forming a secret council of like-minded citizens who carry out secret missions to promote justice over cruelty and abuses of power.

She is the last of her kind...  It is not a peaceful time in the Dells. In King City, the young King Nash is clinging to the throne, while rebel lords in the north and south build armies to unseat him. War is coming. And the mountains and forest are filled with spies and thieves. This is where Fire lives, a girl whose beauty is impossibly irresistible and who can control the minds of everyone around her.

Read these books if you love a fantasy world and characters you can really lose your self in.