While Belle Gunness and H. H. Holmes may be two of the most recognisable names when it comes to serial killers who operated in the Victorian-era, they are not the only ones. In fact, far from it. There were a huge number of mass slayers at the time, but many are overshadowed by the likes of Jack the Ripper. In today's episode of Cold-Case Detective, we'll be looking at two of these serial killers from the 1800s and their crimes.