Few relationships in American frontier history are as mythic — or as misunderstood — as the bond between Wyatt Earp and Doc Holliday. In his new book, Brothers of the Gun, acclaimed historian and author Mark Lee Gardner brings their story together in a way no one has quite done before: as a dual biography rooted in original research, newly surfaced primary sources, and on-the-ground archival work. We spoke with Gardner about why these two larger-than-life figures remain inseparable in both legend and legacy, what drew him to revisit one of the West’s most retold sagas, and how friendship — fierce, flawed, and deeply human — stands at the heart of their story.