There must be a thousand people in the vicinity of Westminster Bridge on this beautiful evening...in approximately thirty minutes' time, many of them will be dead. Mark Joesbury, of Scotland Yard's Covert Operations Unit, is undercover. Embroiled in a terrorist gang's plans for a deadly attack at the heart of the capital, he's risking everything to stop them. But, as they prepare to target London's most iconic landmarks, it's no longer just countless...