John Hoffmeister

Afer being stabbed with an ancient, germ-infested knife, a doctor's assistant finds himself with an insatiable desire for blood. (imdb)

Michael and Lee Berger are an unhappily married couple looking to rekindle the spark in their marriage. After moving to Puerto Rico to live in a house Michael inherited from his brother (who killed himself after murdering his wife), they decide to try swinging, with disastrous results. The wounds in their marriage begin to open up, as each character becomes slowly undone mentally over the course of the film. However, while their personalities may clash, their bond is unbreakable.

When two prominent black anthropologists, Dr. Green and Dr. Matara, uncover the remains of an ancient African tribe of bloodsuckers called the Myrthians they unleash an evil force buried for centuries beneath the earth.