Le Manoir de la terreur

The nights of terror are unleashed when a professor's thirst for knowledge seals his own demise when he unwittingly unseals a cursed underground crypt in an ancient burial ground!
The desecrated graveyard erupts with a ground swell of ravenous, rotting, flesh hungry zombies that shamble into the night in search of living human prey! On the adjoining grounds, a group of clueless, decadent socialites are enjoying a wild weekend retreat of debauchery. Among the the eccentric guest are a nympho mother and her freakish, incestuous son! Unfortunately for the guests, their isolated country villa lies directly in the path of the flesh-eating horde that have party plans of their own! (official distributor synopsis)