Nothing on Earth begins in total darkness. (No exit signs? Is that even legal?) We see a ghostly figure float by. We hear spirits signaling their presence by pressing buzzers. And then the seance is cut short as Houdini turns on the lights and proceeds to explain how each effect was created: no spirits here.
By the time we get to the climactic seance. led by then-famous medium Mina (Margery) Crandon, we have heard many letters from Houdini to his wife, seen debates between Houdini and Doyle, and gotten a peek behind the scenes at the Crandons, all presented badly, with missing information, unsuccessful overlapping of dialogue, and a generally boring sloppiness.