Primal Thirst Enigma Directive Series, Book 1.

Wisecracking cryptozoologist Dr. Obadiah "Jack" Jackson has hunted plenty of dangerous creatures over the years. But he finds a lot more than he bargained for when he travels to Malaysia to save a beautiful missionary and her village from being ravaged by ghoulish, blood-feeding monsters straight from local legend known as the jenglot. The jenglot are very dangerous, elusive, and intelligent. But that's the least of Jack's troubles. Others beside...