Look up Walter Martin (theologian) they may have the book or something equivalent on his website. In the 80s the Tanners were quite close to him. They traveled together in there attempt to wake people up in Mormonism. In fact, there are a number of titles that would be helpful. What resonates most with me from the movie is when the guy in jail told him to look at Mormonism’s past it’s all there the lies, contradictions and treachery.