Explosives Officers Lana Washington and Joel Nutkins are called to investigate a potential bomb factory in a London housing estate.

As the bombing campaign intensifies, so do inter-community tensions as the far-right group English Flag take to the streets.

A far-right group called the Crusaders claim responsibility for the mosque attack as Lana finds a forensic link between the bomb at the mosque and the one at Westhaven - were they both bombed by the same person?

Following the murder of a Counter Terrorism officer, Lana Washington and the EXPO team race against time to stop the bombers before they strike again.

Lana struggles to come to terms with her personal loss, and her failure to prevent the explosion. Meanwhile, Counter Terrorism officers launch a manhunt for someone.

The EXPO team are stretched to breaking point dealing with a complicated device planted at the Campaign HQ. Lana tells Karl something important.