"For Sarah Krasnostein, it begins with a Mennonite choir performing on a subway platform, a fleeting moment of witness that sets her on a fascinating journey to discover why people need to believe in absolute truths and what happens when their beliefs crash into her own. Some of the people Krasnostein interviews believe in things many people do not: ghosts, UFOs, the literal creation of the universe in six days. Some believe in things most people...