Originally published as a 24-week correspondence course, The Master Key System is a step-by-step process for achieving the success that you've always desired. Using the creative power of thought, Charles F. Haanel will help you understand and harness your own mental power in order to manifest the life you long for.

Each of the 24 lessons includes study questions and responses to deepen your understanding of the material. Practical and accessible, The Master Key System is a transformative guide to living a fulfilling, successful life.

The Master Key System is part of the GPS (Good, Practical Simple) Guides to Life series, which aims to introduce a new audience of readers to the life changing writings of past generations. This new edition also includes the bonus book Mental Chemistry also by Haanel.