KILLER COUPLES is a 4 x 60’ series investigating the relationship between deadly partners in crime. How did Myra Hindley and Ian Brady go from initial attraction, dating and falling in love to jointly plotting the abduction, rape, torture and murder of young children? International best-selling crime novelist Mark Billingham embarks on a journey in each episode to get inside the minds of a different Killer Couple and to find out why and how teaming up as a duo triggered such terrible acts of crime