There's a really good Philosophy textbook called 20 Questions. It's available on Amazon, or you could check with any University bookstore or message board and get a cheap used one.
It's a really good start, and as a text, gives questions for pondering after each section (yes, there are 20 questions/sections).
EDIT 'cause this disappeared.
You may also want to check out Dr. James Penton's books. He was a born-in, strong JW family. First book is while he was a JW, other writings are after he left. He writes about JW history.
While still a member, he wrote Jehovah’s Witnesses in Canada: Champions of Freedom of Speech and Worship (1976), a history of the religion's struggle for religious freedom under Canadian law, in which he claimed that much of the political and theological attacks on the Watch Tower Society had been grossly unfair. He subsequently appeared on a national current affairs television program in Canada defending the religion's doctrines and denying its leaders were guilty of false prophecy.[11] The book gained brief mentions in the society's magazine The Watchtower (quoting a Toronto Star review) and three years later in a Yearbook article about the Witnesses' history in Canada, although Penton later wrote that he found it curious that the society refused to quote directly from it or otherwise mention it in publications or conventions. "As a result," he wrote, "some Witnesses manifested direct hostility towards it. On occasions I was openly criticized by particularly narrow Witnesses with 'trying to make money on the brothers' or 'trying to make a big fellow out of myself'."[12]
He began work on Apocalypse Delayed: The Story of Jehovah's Witnesses soon afterwards, but halted his research and writing in 1979 after developing concerns over what he viewed as a growing punitive response of the religion's leadership to doctrinal dissent from within its ranks.[3] He resumed work on the book after his expulsion and it was published in 1985. In 2004 he published Jehovah's Witnesses and the Third Reich: Sectarian Politics under Persecution, which highlights what he claims are discrepancies between the religion's official history of its opposition to Nazism during World War II and documented facts. Historian Detlef Garbe, director at the Neuengamme (Hamburg) Memorial, criticized Penton's "new theory" that in the 1930s the Watch Tower Society had "adapted" to National Socialism's anti-semitic aggression. Garbe suggested Penton's interpretation reflected a "deep-seated aversion" against his former religion and that "from a historiographic viewpoint Penton's writings perhaps show a lack of scientific objectivity".[13]
Penton has also edited two journals, written five articles about Jehovah's Witnesses and also wrote the Canadian Encyclopedia's entry about the religion.[14]
Enjoy!
tal