 Francis Barnard goes to Spain, when he hears his sister Elizabeth has died. Her husband Nicholas Medina, the son of the brutest torturer of the Spanish Inquisition, tells him she has died of a blood disease, but Francis finds this hard to believe. After some investigating he finds out that it was extreme fear that was fatal to his sister and that she may have been buried alive! Strange things then start to happen in the Medina castle.