"As the daughter of a rancher in 1840s Mexico, Nena knows a thing or two about monsters - her home has long been threatened by tensions with Anglo settlers from the north. But something more sinister lurks near the ranch at night, something that drains men of their blood and leaves them for dead. Something that once attacked Nena nine years ago. Believing Nena dead, Nestor has been on the run from his grief ever since, moving from ranch to ranch...