Satan's Snowdrop

When Al Pennant buys the huge mansion overlooking the Reichenbach falls, he knows that it's last owner was a Nazi who tortured many people to death on the premises, but only his son Tod senses that his evil is still there. When they move in, Tod starts seeing things; then Al's wife, Veronica, witnesses a torture. Even then he persists in transporting the entire mansion to Long Island. But the evil remains, and they keep on seeing reruns of Reichenbach's torturous exploits. And the link between past and present seems to be the single snowdrop in front of the house, a flower that periodically seems to be surrounded by blood.