![Double Impact](https://image.tmdb.org/t/p/w185/tmzwvSqoMC37Tgqwj4mA2dHNSmw.jpg)
During a handover to the head of counter-terrorism of MI5, Harry Pearce, a terrorist escapes custody. When Harry disappears soon after, his protégé is tasked with finding out what happened as an impending attack on London looms, and eventually uncovers a deadly conspiracy.