Gloomy Terrors and Hidden Fires: The Mystery of John Colter and Yellowstone . By Ronald M. Anglin and Larry E. Morris. (Lanham, MD: Rowman & Littlefield, 2014. xi + 243 pp. Illustrations, maps, appendices, notes, bibliography, index. $35.00, £21.95.) From the outset, Ronald M. Anglin and Larry E. Morris make two things undeniably clear about John Colter. The first is that although his life in the wilderness lasted but a few short years, Colter’s honored place in the popular imagination of the American West remains unshakeable two centuries later, and his legacy is one of enduring if not confounding historical fascination. Second, despite the fact that Colter left not a shred of personal documentation of his exploits, he more than earned his legendary position in western history and lore. As the authors point out, Colter was such a crucial member of the Lewis and Clark … cmagoc{at}mercyhurst.edu