In 2009, Tiger Woods was the most famous athlete on the planet, a transcendent star of almost unfathomable fame and fortune living what appeared to be the perfect life. But it turned out he had been living a double life for years–one that exploded in the aftermath of a Thanksgiving night crash that exposed his serial infidelity and sent his personal and professional lives over a cliff. Jeff Benedict and Armen Keteyian dig deep behind the headlines to produce a richly reported answer to the question that has mystified millions of sports fans for nearly a decade: who is Tiger Woods, really?