Faced with bomb outrages, a mounting death toll, plus impatient politicians and media, this team of investigating detectives are up against it.
There is information aplenty, though none of it points to a motive, or obvious killers.
Worse, other agencies seem to be working against them; more so, when their focus turns to Germany and long forgotten events during World War Two, the Cold War, let alone the present day.
Months of work reveals...