On 7 July 2005, bombs go off at four separate sites across London, sparking untold devastation and the biggest manhunt the United Kingdom had ever seen.

The police are desperate to find the bombers, but the trail is getting cold. Until a call from a member of the public turns the investigation around.

Two weeks after the bombing, the situation escalates yet again. Desperate to find the attackers, the police double down on their hunt.

The clues take the investigation from London, to Luton, to Leeds, where the community is left reeling at the news — and the backlash from the media.