The Masa Grinder of Isla Perdida

A disillusioned missionary and a hardened drifter find themselves trapped on a forgotten Caribbean island. Lured into a midnight deal by a woman who has cheated death, they become the intended sacrifice for a soul-devouring entity. Their only hope lies in the cryptic riddles of the Lord of the Dead and the missionary's own shattered faith. But survival has a price, and some debts can only be paid in the grave.