

A British woman visits her husband at the Mexican mine he is attempting to reopen and discovers that the workers refuse to enter the mine, fearing an ancient curse. The couple enter the mine to prove there is no danger and inadvertently release a demon which possesses people's left hands and forces them to behave in a suitably diabolical manner.
Practical Effects
Disembodied hand effects that are gloriously unconvincing.
Acting
Samantha Eggar giving 110% to possessed hand acting.
Director
Alfredo Zacarías
Trivia, insights & behind the scenes
Samantha Eggar was a legit Oscar nominee for The Collector (1965); this was her 'what happened to my career' era.
Part of the early '80s Satanic Panic wave, where every shadow hid a cult and every appendage was vulnerable.