We are born masters but sometimes, especially during the trials of adulthood, we need external guidance to reach our potential, says bestselling author Greene (The 48 Laws of Power). His description of mastery is reminiscent of what positive psychologists describe as "flow": a state that feels effortless once achieved. Yet mastery requires work. Greene outlines the process in nearly 50 steps, with several overarching themes: retaining a child's sense of wonder, learning from other masters, and avoiding financially motivated goals. The steps are interspersed with the stories of people who have famously achieved success: the Wright Brothers, Benjamin Franklin, Thomas Edison, Mozart, Temple Grandin, and many more. Relatively few of these examples are contemporary, which poses the question of whether such mastery is possible in our current economic and profit-driven environment. And 48 steps are a little much for even the mastery-oriented mind, and Greene's presentation is disjointed and occasionally confusing. But what this book lacks in clarity it makes up for in its stories and persistent encouragement—the inspiration that is essential for anybody who strives to live a full, mastered life. Agent: Michael Carlisle, Inkwell Management. (Nov.)