Follow the Dawn by Rachelle Rea Cobb

Anna Emory grew up the invisible, shy younger sister, and she prefers it that way. But when her father attempts to arrange an unsavory marriage, Anna learns that courage is sometimes found in adversity. Then she meets a boy and his father struggling in their relationship, and they tip her quiet world upside down.
Captain Mathieu Tudder has run from responsibility, entrusting his young son’s care to another and devoting his Sea Beggar ship to the Dutch Revolution. After that cause fails, Tudder returns to England for the son he left behind. But his son seems to have given his heart to a unknown and quiet lady—a woman who reminds him of all he’s ever loved and lost.
Will these two hearts—the battle-scarred and the broken—ever find true freedom?