A gang of pirates rape the two sole survivors of a ship wreck. The violated girls are rescued by the strange inhabitants of a supposedly haunted island, where they are granted supernatural powers to strike revenge against the pirates.

Adaptation of Boileau-Narcejac's novel "Les Diaboliques", already filmed in 1955 by Henri-Georges Clouzot.

Jason Avery is an ex-cop now working as a museum security guard. Armed thieves break in intent on stealing a priceless obelisk that's stored within this vault-like stone structure. The scientist behind the theft talks of the obelisk giving him the power to control harpies, demonic winged female monsters of classic mythology. Through a series of contrived events, the obelisk opens a time portal that Jason promptly falls into, crash landing over a thousand years in the past in a land threatened by evil harpies.