Why do they have to tinker with a great story? Alan Furst's novel is moody, atmospheric and evocative of the period, pre-WW2 Warsaw. The BBC adaptation is lifeless and sterile. The screenwriters have tried to cherry-pick the salient parts of the novel, but all this has achieved is a confusing storyline with no sense of continuity. David Tennant is hopelessly miscast as Mercier, which in turn ensures the viewer will find the series pretty unbelievable. Janet Montgomery's portrayal of Anna Szarbek(Skarbek? Why?) is unfortunately not very likable, which in turn means their relationship suffers on the screen. Both Tennant and Montgomery have mishandled the relationship between Mercier and Szarbek, which is one of the critical drivers of Mercier's actions. A number of other characters (Jourdain, Dr Lapp) have been similarly poorly written and portrayed. Very disappointing all round. I just hope they don't try and adapt any more of Alan Furst's novels - fans of Furst's novels will be very disheartened.