London is rocked by terrorist attacks as armed police shoot dead an innocent man on his way to work.
In the aftermath of the devastating 7/7 London bombings, another terrorist cell plots an attack.
A police surveillance operation ends in tragedy after an innocent tube passenger is shot dead.
As the Met grapples with the fall-out from the shooting, a secretary makes a life-changing decision.
With the police force engulfed in crisis, senior officers are confronted with hard truths.
