Yes, I’ve read it, or most of it - it’s a long book with some dry patches.
The research and writing is by Rud Person. James Penton contributed a foreword and complimented Rud Person on his research and the end product.
I’m not entirely sure what to make of the book. It has a lot of interesting information, for sure, and its central thesis that Rutherford took control of Watchtower illegitimately, a familiar claim among former JWs, is supported in some detail with reference to contemporary documents. The whole matter seems complicated and the discussion is dense. I think it would require more concentration and follow-up on the references than I was able to give to it for a conscientious reader to determine whether the case is convincing. The book has interesting features including mini biographies of some of the key figures and appendices that provide interesting additional material including an interview with old Bethelite recalling his time at headquarters during Rutherford’s presidency.