No murderer had before or has since caused such a sensation, passed so quickly into folklore or gained an image – top hat, cape and Gladstone bag – that is truly iconic: as instantly recognisable as Sherlock Holmes's deerstalker and meerschaum pipe, and as capable of conveying a meaning understood around the world – even by people who know nothing about the Ripper or what he did, or that he, unlike Holmes, actually existed.

Paul Begg