Complete Original Text with full set of Haanel"s Questions & Answers after each chapter. The Book that will not only leave you "feeling" good, but also "thinking" good. In The Master Key System, presented as a series of twenty-four lessons, Charles Haanel discusses everything from how to feel healthy to how to become wealthy. One of the great classics of all times with millions sold world-wide and rumored to be what inspired Bill Gates to leave Harvard and start Microsoft.