Episode two will feature John Duffy and David Mulcahy, who - in the 1980s - operated together as two of the most prolific rapists in British criminal history.
Season 1
S01:E01 - Episode 1
In the first episode, Mark will examine the most infamous killer couple in UK criminal history - 1960s child-killers Myra Hindley and Ian Brady
S01:E02 - Episode 2
Episode two will feature John Duffy and David Mulcahy, who - in the 1980s - operated together as two of the most prolific rapists in British criminal history.
S01:E03 - Episode 3
The bizarre 1970s case of Roy Hall and Michael Kitto (episode three) is perhaps the most incredible crime story you've never heard of.
S01:E04 - Episode 4
Finally in episode four, Mark explores the contemporary case of Lee Whiteley and Deborah Taylor - real-life natural born killers
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