Two. I've read both of Franz's books. They were a game-changer for me.
SFPW, they were hardly propaganda and vicious lies. ISOCF started of like Franz was a grumpy old man, but the rest of the book was just as well written as CoC. They were point of view books that gave clear evidence as to why Franz maintained that view. While most JW books are point of view books as well, they are presented as absolute truth, until new absolute truth replaces it, that is. Franz never lied about the purpose of his books, that certain facts could be wrong based on his limited experience, or that he should believed. Instead he encouraged you to make your own opinions based of evidence you learn from not only his book, but both JW and secular information.