Danny Wallace was bored. Just to see what would happen, he placed a whimsical ad in a local London paper. It said, simply, "Join Me." Within a month, he was receiving letters and emails from teachers, mechanics, sales reps, vicars, schoolchildren and pensioners--all pledging allegiance to his cause. But no one knew what his cause was. Soon he was proclaimed Leader. Increasingly obsessed and possibly power-crazed, Danny risked losing his sanity and...