"For years, one of the funniest men in America was crying on the inside. Jeff Allen was a comedian with the lead role in a tragedy. Born into a tough working-class Chicago family, Allen fell into substance abuse at an early age, and his problems didn't magically go away when he got married. In fact, with the arrival of two children, they intensified. The sense that his life was meaningless made his family life as dark and biting as his comedy. But...