Texas Ranger Norman Dixon made the front pages of newspapers, but his rigid sense of integrity prevented him from discussing his cases with his wife or his sons, or anyone else, even decades later.

As a Ranger, Dixon broke up the largest oil field theft ring in Texas history, worked to solve the most infamous cold case in Texas history, sought the Phantom Killer, investigated a near-mutiny by cadets and veterans on the campus of Texas A&M, rushed to a rural county to head off a lynching, and kept watch over Texas during World War II. He became the go-to investigator for the director of...