For nearly 100 years, the question has repeatedly been asked: who was 'Jack the Ripper'? The real question that should be answered, however, is why? Why were five poor, defenceless women savagely murdered in the slums of Whitechapel in the autumn of 1888? Credible Victorian sources including an Old Etonian police chief (Sir Melville Macnaghten), a famous writer on true crime (George R. Sims), a Conservative MP (Henry Farquharson) and, most incriminatingly,...