"Lovely Zared Peregrine was the pride of her family, a treasure her rough-hewn brothers would strive at any cost to protect from their ancient enemies, the Howards. The Peregrines have suffered loss enough. Thus Zared's brothers trained her in the arts of war, and dressed her in boy's clothing. Beyond castle walls, none knew that the youngest Peregrine was a girl..."
(taken from blurb on back)

Romance novel with some nice touches. I haven't read it in quite awhile so I can't do justice to it.