What is it about their work that makes firefighters so devoted—addicted, even—to the calling? Leschak (Trial by Wildfire), a 20-year veteran wildfire fighter, attempts to answer this question in his contemplative memoir. He focuses primarily on the spring of 2000, when he led a helitack crew (a rapid-response helicopter unit) battling especially fierce and persistent wildfires in western Montana. That was also when Leschak discovered the diaries of Father Peter Pernin, a survivor of the 1871 fire that leveled Peshtigo, Wis. He threads the story of the Peshtigo fire throughout the book, along with other historical facts about American forest fires and the formation of a wildfire "subculture." As he describes the dangers faced by his own team, the plainspoken, articulate Leschak explores the psychology and spirituality of fire fighting—particularly the "exhilaration" of life-threatening situations—citing sources as diverse as Carl Jung, Friedrich Nietzsche, William James and Walker Percy. Leschak had trained to become an evangelical minister in East Texas, and he recalls his conversion to evangelism at age 18, after listening to a radio preacher; his growing disillusionment with the narrow-mindedness of his Bible college; and his revelatory discovery of his true life's work. In spite of its prominence in the subtitle, the story of the Peshtigo fire is woven casually and sporadically into the book; those looking for a sustained history should turn to another book on the Peshtigo fire being publishing the same month (Firestorm at Peshtigo, Forecasts, June 24). Nonetheless, Leschak's action scenes crackle with energy, and his down-to-earth account of his spiritual quest should strike a chord with many. (Aug.)