I am reading "Apocalypse Delayed'-2nd Edition by M.James Penton-UTP; ISBN 0-8020-7973-3. 1997.
This a kind story of how the JW came about from the early days of Russel and his un-natural marriage through to the Rutherford (same) and it does not pull any punches as it wades into the latter Rutherford era the failed predictions (1975) and the nasty way by which people were treated.
This will not convince anyone you know who is 'in' if you wish to see them 'out' as such people are blind to any sort of argument and will have no ability to discuss, but will give the reader an immense breadth and depth of background material as to why things happened. How I wish i had found such a work years ago!
One of the back page comments says. "This is not a vindictive slamming of the Witness organaization by a raving ex-member, but a carefully written, well documented critical analysis by a scholar with the special insight that only a former insider could give". and i could not agree more.