A Study in Crimson

London, 1942. A killer going by the name of "Crimson Jack" is stalking the wartime streets of London, murdering women on the exact dates of the infamous Jack the Ripper killings of 1888. Has the Ripper somehow returned from the grave? Is the self-styled Crimson Jack a descendant of the original Jack -- or merely a madman obsessed with those notorious killings?