Luna

Luna is the fighter, the one that her friends can depend on. Gray is the warrior, the one that tells bad jokes. Ana is the princess, the one who skips her classes. These three are the friends that were supposed to be together. Until Ana runs away when her father, the king, orders her to marry a foreign prince.
That was a year ago. Luna, once the calm water, has become ice. She and Gray spend all their time searching for her, with no hope. Then, Rowan, a strange man from another country, comes. He claims to know where Ana is, and will help Luna and Gray find her. However, he has a price, and it's a big one.