Young workers are dying because of a mysterious epidemic in a little
village in Cornwall. Doctor Thompson is helpless and asks professor
James Forbes for help. The professor and his daughter Sylvia travel to
Thomson. Terrible things happen soon, beyond imagination or reality.
Dead people are seen near an old, unused mine. Late people seem to live
suddenly. Professor Forbes presumes that black magic is involved and
someone has extraordinary power. He doesn't know how close he is: the
dead become alive because of a magic voodoo-ritual, and so they must
serve their master as mindless zombies to return to life.