Episode 3

In a major breakthrough, police use CCTV to trace the movements of the bombers from King’s Cross back to Luton. They identify a fourth bomber and begin to search for a reason why four apparently ordinary men have chosen to kill 52 people.

Unknown to the police, another conspiracy is brewing and comes to fruition on 21 July, with four more bombs being planted on London’s transport network. This time, they don’t kill or injure anyone, as they fail to properly detonate. But the bombers are still on the loose.

Twenty-four hours later, intelligence leads the police to a south London address. They follow a man who they believe could be one of the bombers and track him to Stockwell tube station. Surveillance officers follow him onto a train, and firearms officers run onto the carriage and shoot him dead.