Re: Yuck.
I have every belief that the supernatural content in the film is faked (in story, obviously they didn't use real magic while filming to save on yhe special effects budget) and that's what Holmes is investigating.
Like Jonathan Creek if you've ever seen that show.
It is ironic that the character debunked the supernatural, while Arthur Conan Doyle believed that Houdini had magical powers despite his insistance that he didn't.