Throne of Glass by Sarah J. Maas

Throne of Glass is the story of a female assassin named Celaena Sardothien, the most notorious assassin in Erilea. She is taken from her place in prison by the Crown Prince of Adarlan, the main conquering force of Erilea. Dorian Haviallard, the prince, offers her a deal. If she competes in a competition as his champion, she will be freed from the terrible prison after four years in the king's service. Celaena agrees. From there, the story follows Celaena as she re-trains her body and becomes a great assassin once again. She competes in the contest to be the King's Champion along with twenty-three other people of various criminal professions, all while hiding her own identity. Celaena trains with Chaol, the captain of the guard, in the mornings, and rarely sees the prince except for during the trials. Her bond with Chaol is predictable, as well as with the attractive prince. This is where my iss...