Desc: Knocking on Death's Door: Directed by Mitch Marcus. With Brian Bloom, Kimberly Rowe, John Doe, David Carradine. Two paranormal scientists attempt to document the spirits which reside at Hillside House. They track down the murderer of a little boy, whose ghost is still alive. What they don't realize is that by discovering the murderer, they might be the next two humans to become ghosts.