The vast majority of killers prey on their victims alone and undercover, but in a tiny number of cases, two people are drawn together to form a deadly duo. And when they do, they’re usually even more brutal and sadistic than those who murder alone. In Killer Couples, popular crime writer Mark Billingham examines four unique and mind-boggling cases.
Episodes
Season 1
Media
Backdrops and posters from the title's official gallery
