(an aside to slimboyfat - even though the opening post didn't mention CoC or ISoCF, I did catch Orphan Crow's "vibe" ;)
I wanted to mention them anyway... those books are too powerful in the awakening process to ignore.)
She mentioned Schnell, who wrote "Thirty Years a Watchtower Slave", which I have also read, but it was a little hard going at times. He gives insight into the mind of Rutherford and the goals of the early days of the organization, and the DELIBERATE campaign to get rank and file members jailed or persecuted in order to gain publicity.
Schnell remained a "fundamentalist Christian" or whatever he called himself, the book had much ravings about the organization being the beast of Revelation, but if you can get past that, there is some interesting historical stuff.