With a looming Brexit vote wreaking havoc across the British political landscape, tensions are high for activist Matthew Collins (Stephen Graham) and his advocacy group Hope Not Hate, who fear a violent, racist campaign from the British far-right.

And when a number of Islamist-related terrorist attacks rip through the British public in 2017, right-wing extremist group, National Action sense an opportunity.

When MP Jo Cox (Bryony Corrigan) is murdered in the street by a right-wing fanatic, National Action decide this is the moment to avenge the ‘downfall of white society’ in Britain, and plan to escalate a terrifying situation into a full-blown race war.

Series One, Episode Four:

As the police build their case, activist Matthew Collins must keep far right ‘Walk-In’ Robbie Mullen safe. But he brings his own family in danger when his young children are targeted. As he tries to help Mullen, Collins’ own past as a former BNP member comes back to haunt him.

The Walk-In – New Episode – Thursday, 23 February at 9.20pm on SBS and SBS on Demand (5 Parts)