I'm reading Voodoo Histories: The Role of the Conspiracy Theory in Shaping Modern History.
It's a semischolarly work not so much about conspiracy theories, but rather about how they kind of spread out and affect the overall culture.
It's very informative and well researched, though it's easy to see how the author is possibly just standing on the shoulders of giants, as conspiracy debunking isn't exactly new or niche, however, as a long time fan of conspiracy theory and paranoid psychology, this book has managed to provide me with some information I didn't know previous to picking up the book.
The first section is entitled 1919 and is about how there was a general sense of people, postwar, tried to make sense of the conflict, and look for people to blame for it and how blame was ready made in the propagation of The Protocols of the Elders of Zion. The book goes through the history of the dispersal of The Protocols and about how it received wide and popular press from European and American newspapers, and a great deal is made of Herny Ford's latching onto the work and how he promoted it in The Dearborne Independent, his own newspaper.
The book then goes through the history debunking of the Theory, how The Protocol was essentially plagiarized from a German Right-Wing Romance (in the Sir Walter Scott, not Diane Steele mode) that had been translated to Russian, then translated back by someone claiming to have gained access to the original documents which The Protocols purport to be.
It's really fascinating reading and is highly recommended for anyone who enjoys reading about Conspiracy Theories or niche history. The book, so far, is quite well written. Informative and wryly funny.