I can't give this higher than one star. This book took me almost 2 months to get through because I had to spend as much time fact-checking it as I did reading it. After combing through multiple newspapers and scanned historical documents, I can only conclude that Arthur Conan Doyle purposely misrepresented "the facts" as he refers to them. This was actually very disappointing to read as a fan of the Sherlock Holmes stories.
Intellectual dishonesty aside, the book itself is mostly a chronicling of sort-of-famous mediums from around Doyle's time. What they did at their seances. Which fancy gentlemen of good reputation attended the seances and believed them. Which unsympathetic naysayers foolishly dismissed the seances. Most of the mediums are caught faking their seances. Many of them confess to faking their seances. Doyle insists that this doesn't mean that all their results were faked, but I disagree. If I caught a scientist forging results once, I would never accept another report from them and I would need to have all their previous results independently re-verified. Since Spiritualist's results can't ever be duplicated, I would just have to throw them out.
This was an utter waste of everyone's time, including Doyle's. I'm not even sure what it is that we're supposed to gain from Spiritualism other than some weak assurance that life continues after death. I'm also not sure how anything that happened in the seances is supposed to prove that there is life after death. The spirits seem to waste a lot of energy levitating tables, moving objects, and trying to convince me they're actually my grandmother when they could just be telling us whatever it is they want us to know. Talk about meetings that could have been e-mails, you know? Doyle doesn't spend much time on Spiritualist philosophy, practice, or belief. It's all just lame arguments about ghost hunting nonsense.