Measure for Measure is one of William Shakespeare's more enigmatic works. As one of the so-called "problem plays," it mixes a dark plot with light overtones, without resolving the tensions inherent in either. Its central conflict is spurred on when the Duke of Vienna, Vincentio, confers his powers on the law-abiding judge Angelo before leaving on a diplomatic mission. In reality, Vincentio has merely disguised himself as a lowly friar to watch Angelo's rule from afar—a rule that is quickly...