A group of paranormal investigators journeys into the Louisiana swamps to investigate a series of deaths among young women—each found drained of blood. Unbeknownst to them, they’re entering the territory of a sabbat-master. The question is whether anyone will survive. “The Witchmaker” (1969) belongs in the same category as films like "The City of the Dead” (1960), "Masque of the Red Death" (1964), "Devils of Darkn…