The Lost Prince — Julie Kagawa

Don't look at Them. Never let Them know you can see Them.

That is Ethan Chase's unbreakable rule. Until the fey he avoids at all costs -- including his reputation -- begin to disappear, and Ethan is attacked. Now he must change the rules to protect his family. To save a girl he never thought he'd dare to fall for.

Ethan thought he had protected himself from his older sister's world -- the land of Faery. His previous time in the Iron Realm left him with nothing but fear and disgust for the world Meghan Chase has made her home, a land of myth and talking cats, of magic and seductive enemies. But when destiny comes for Ethan, there is no escape from a danger long, long forgotten.