In the summer of 2012, Kristin, Michael, and their two children climbed into the family car with 100 days' worth of equipment, clothing, and investigative desire. Knowing their tribe of Christians to be quite reserved around the subject of evangelism, the Carroccinos set forth to catch Episcopalians in the act of sharing their faith. Along the way, they invited friends far and near to collaborate toward a new understanding of evangelism as spiritual practice. Over five months of conversation and 15,000 miles of driving, Michael and Kristin journeyed into an unseen world, where Episcopalians...