James B. Mills’ In the Days of Billy the Kid offers a fascinating look at the world surrounding one of the most famous outlaws of the Old West. But rather than just rehashing Billy the Kid’s well-worn story, Mills shifts the focus to four other key figures—José Chávez y Chávez, Juan Patrón, Martín Chávez, and Yginio Salazar—whose lives intersected with the chaos of New Mexico’s Lincoln County War and the broader struggles of the region.

One of the book’s biggest strengths is how deeply Mills dives into the historical record. He doesn’t just rely on legend—he pieces together firsthand accounts, court records, and contemporary sources to give a well-rounded and often overlooked perspective on the Hispanic and Native figures who played critical roles in shaping this turbulent period. The book does a great job illustrating the political corruption, racial tensions, and sheer lawlessness of the era, making it clear that the Lincoln County War was far more complex than just Billy the Kid versus the law.

Mills’ writing is detailed and well-researched, though at times it leans more toward an academic tone than a breezy Western narrative. If you’re looking for a fast-paced outlaw story, this might not be it. But if you want a serious, well-documented account of the people and events that shaped this legendary period in the West, it’s a rewarding read.

Overall, In the Days of Billy the Kid is a must-read for anyone interested in the Lincoln County War beyond just the usual myths. Mills delivers a well-rounded, in-depth history that sheds light on figures often left in Billy the Kid’s shadow.