Blood Thirst, also known as Blood Seekers and The Horror from Beyond, is a black-and-white 1971 horror film

Horror film

Horror films seek to elicit a negative emotional reaction from viewers by playing on the audience's most primal fears. They often feature scenes that startle the viewer through the means of macabre and the supernatural, thus frequently overlapping with the fantasy and science fiction genres...

 directed by Newt Arnold and shot in the Philippines

Philippines

The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

. It tells of an American detective

Detective

A detective is an investigator, either a member of a police agency or a private person. The latter may be known as private investigators or "private eyes"...

 investigating a series of vampiric

Vampire

Vampires are mythological or folkloric beings who subsist by feeding on the life essence of living creatures, regardless of whether they are undead or a living person...

 murders linked to a Manila

Manila

Manila is the capital of the Philippines. It is one of the sixteen cities forming Metro Manila.Manila is located on the eastern shores of Manila Bay and is bordered by Navotas and Caloocan to the north, Quezon City to the northeast, San Juan and Mandaluyong to the east, Makati on the southeast,...

 nightclub

Nightclub

A nightclub is an entertainment venue which usually operates late into the night...

. Blood Thirst was reportedly filmed in the 1960s but not released until the early 70s, where it mostly played the American grindhouse

Grindhouse

A grindhouse is an American term for a theater that mainly shows exploitation films. It is named after the defunct burlesque theaters located on 42nd Street in New York City, where 'bump n' grind' dancing and striptease were featured.- History :...

 circuit.

Plot

The film's plot, scripted by N.I.P. Dennis in his only listed film credit, is frequently nonsensical, involving a South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

n belly dance

Belly dance

Belly dance or Bellydance is a "Western"-coined name for a traditional "Middle Eastern" dance, especially raqs sharqi . It is sometimes also called Middle Eastern dance or Arabic dance in the West, or by the Greco-Turkish term çiftetelli...

r, played by Yvonne Nielson, who has uncovered an ancient Aztec

Aztec

The Aztec people were certain ethnic groups of central Mexico, particularly those groups who spoke the Nahuatl language and who dominated large parts of Mesoamerica in the 14th, 15th and 16th centuries, a period referred to as the late post-classic period in Mesoamerican chronology.Aztec is the...

 secret for eternal life, involving regular blood transfusion

Blood transfusion

Blood transfusion is the process of receiving blood products into one's circulation intravenously. Transfusions are used in a variety of medical conditions to replace lost components of the blood...

s. To this end, she has enlisted the aid of a Filipino club owner whose visage turns monsterous when he is stalking his prey.