On the tip of the Yucatan peninsula, the immortal Castillo family gathers in Tulum. Weary and haunted, they receive the names of fifty-two human sacrifices chosen once every fifty-two years for the Underworld. Something is different about Zara: Lucas has been having dreams of her arrival for five hundred years. As Lucas and Zara come together to put an end to the bloody sacrifices, they discover that the ancient tradition isn't so easily broken.