Callista

From the back of the book: Her family tricked her into a bethrothal with an evil old man. There was nothing to do but run.... The first thing Callista did was disquise herself as a boy; which was not easy with her long raven locks and voluptous body. But she managed to get herself hired as a cabin boy aboard a ship bound for America. Her secret was safe until she fell ill and the captain discovered she was a loely young woman. He become obsessed with her. Finally he seduced her. This was the beginning of a strange love affair in which Callista found herself equally obsessed.