The White Chapel Solution by Wild-Colombini Magic - Trick

A mystery finally solved. The search for Jack The Ripper is over! You show four cards (all possibly Jack the Ripper) and a Joker (Inspector Aberline) and while telling an amusing story introducing various suspects that could have been the Ripper, a spectator with all the cards in his hands, selects a Jack and this card proves to be The Ripper. How? Showing to have blood stains on its back (red-backed card). Other suggestions given by Peter Duffie and Robin Robertson. Complete with cards and entertaining patter presentation. All the cards can be examined.