The House of the Four Winds (One Dozen Daughters #1) by Mercedes Lackey and James Mallory
Synopsis: The rulers of tiny, impoverished Swansgaard have twelve daughters and one son. While the prince’s future is assured, his twelve sisters must find their own fortunes. Disguising herself as Clarence, a sailor, Princess Clarice intends to work her way to the New World. When the crew rebels, Clarice/Clarence, an expert with rapier and dagger, sides with the handsome navigator, Dominick, and kills the cruel captain. Dominick leads the now-outlawed…