Like all great mysteries this begins with a corpse, five in fact.Over the years Ive been asked the same question during interviews concerning my amazing adventures with Mr Sherlock Holmes, which was the most memorable or chilling? Everybody has their favourites. Im sure youve got yours.This particular case has remained undisclosed for almost three decades. Sworn to secrecy, never to divulge the truth while the living were still at risk of reprisals. Ive refrained from publishing or even speaking of those Regents Park murders.Its only safe to do so now due to the fact that those involved are either dead or never to be found again.It remains one of the most astonishing moments in Holmes career and exposes a shocking revelation about his character.John H. Watson, Retd Dr.