Skillfully blending painstaking research, telling anecdotes, and astute analysis, Carpenter - a scholar who has spent twenty years studying American evangelicalism reveals that, contrary to the popular opinion of the day, fundamentalism was alive and well in America in the late 1920s, and used its isolation over the next two decades to build new strength from within.

The book describes how fundamentalists developed a pervasive network of organizations outside of the church setting and quietly strengthened the movement by creating their own schools and oragnizations, may of which are prominent today, including Fuller Theological Seminary and the publishing and radio enterprises of the Moody Bible Institute. Fundamentalists also used youth movements, missionary work and, perhaps most significantly, the burgeoning mass media industry to spread their message, especially through the powerful new medium of radio. Indeed, starting locally and growing to national broadcasts, evangelical preachers reached millions of listeners over the airwaves, in much the same way evangelists preach through television today.

All this activity received no publicity outside of fundamentalist channels until Billy Graham burst on the scene in 1949. Carpenter vividly recounts how the charismatic preacher began packing stadiums with tens of thousands of listeners daily, drawing fundamentalism firmly back into the American consciousness after twenty years of public indifference.

Alongside this vibrant history, Carpenter also offers many insights into fundamentalism during this period, and he describes many of the heated internal debates over issues of scholarship, separatism, and the role of women in leadership. Perhaps most important, he shows that the movement has never been stagnant or purely reactionary. It is based on an evolving ideology subject to debate, and dissension: a theology that adapts to changing times.