"Fifty years ago, a serial killer prowled the quiet city of London, Ontario, marking it as his hunting grounds. As young women and boys were abducted, raped, and murdered, residents of the area held their loved ones closer and closer, terrified of the monster -- or monsters -- stalking the streets. Homicide detective Dennis Alsop began hunting the killer in the 1960s, and he didn't stop searching until his death 40 years later. For decades, detectives,...