A History of Violence : Season 18 Episode 61
BBC One
Aired: September 15th, 2016 @ 1:45 PM EST on BBC One
When an elderly couple's home is petrol bombed, Rob discovers that their neighbour's teenage daughter has links to an extremist group. But can he prove she caused the fire? Valerie gets a surprise leaving do, and Zara finds making friends at Joe's school a challenge.
