Arntfield, who had also served as a cop in London for 15 years, reviewed detailed notes on a number of homicides -- 32 in particular that occurred over the years in which the victims were all women or children. While several were ultimately solved, a number of others remain unsolved, and all show patterns that he was able to link together based on his own observations and other reports. He concluded that, over the years, at least six serial killers were in operation in the city, whose population at the time barely topped 200,000.
The reason London was so full of chaos and stabby mayhem was its location and environment. Called the Forest City, London is replete with trees and forested areas. Lots of cover. It's also about halfway between Toronto and Detroit, a great kind of roadside stop for maniacs, with large stretches of open country on either side that were not monitored by local police, but by provincial police. So a victim killed in London could be dumped outside of London, and unless provincial police found it and linked it to London, neither of the two law enforcement groups would have any idea the other knew anything about the case.
A typical episode of Cops: London was just hours of aimlessly wandering the woods in hopes of stumbling on something squicky.