Complete 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.