Jack The Ripper
A series of particularly nasty murders took place in the [Whitechapel]? area in the autumn of 1888.
At least five (possibly more) prostitutes were killed in the space of a few weeks - Polly Nichols, Annie Chapman, Liz Stride, Catherine Eddowes and Mary Kelly.
One popular theory (see From Hell) is that it was a Masonic plot to cover up the marriage (and subsequent daughter) of the Duke of Clarence and a shop assistant called Annie Crook. There are a number of suspects depending on which theory you subscribe to.