• Charles F. Haanel – Master Key Lesson # 28 (lost chapter) audio April 1, 2017 Charles F. Haanel – Master Key Lesson # 28 (Lost Chapter #4) audio. This audio lesson will be provided shortly, as we are locating a copy of it for you to review. In the mean time, you may review the lesson from the following YouTube video. Share this post Facebook Twitter Google Pinterest Linkedin