In that stately Fitzrovia house, the butler was murdered by a disgruntled pantry-boy; in that one, a king's housekeeper lost her life. In that Kensington flat, a demented playboy murdered a prostitute for kicks; in that Gloucester Road basement, 'Acid Bath' Haigh was busy digesting the bodies of his victims. In those two elegant Chelsea houses, located in peaceful garden squares, a clergyman and his housekeeper were brutally done to death in 1870...