The Success Equation is a gentle book about the difference between luck and skill. There are probably more comprehensive books on the subject, focussing on financial markets (e.g Fooled by Randomness), general decision-making (Superforecasting), or psychology (Thinking, Fast and Slow), but Mauboussin's book is a good (if slightly diffuse) overview that highlights the relevant findings.
The most noteworthy concept in the book is that the rate of mean reversion depends on the relative importance of luck and skill. For skill-based activities, like chess, past success is a good predictor of future success, whereas in "wicked domains" (like markets), there is a good reason for the standard caveat that "past performance is not indicative of future results".