On a frigid January day on London's Whitehall in 1843, a Scottish woodturner named Daniel M'Naghten guns down Edward Drummond, believing him to be British Prime Minister Robert Peel. M'Naghten, who sympathizes with the Chartist cause in Great Britain, claims he intended to murder the Prime Minister-a Tory-because he blames Peel for persecution by the Tories in his home city of Glasgow. Queen Victoria, incensed at the most recent attempt on a high...