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.