This was as good, or even better, than anything I have seen in the genre for a long time. Never mind all the Sherlock comparisons, this was above all that. You don't have to like a character for them to be good. And, believe me, the acting was way better than many of the comparisons cited by some critics. Strong characters. Convincing set-ups. Credible plots and all this set against a background of the rising pan-European anti-semitism which culminated in the Nazis. Very pertinent to our own experience of a new rise of the Right across the globe. Timely, powerful and entertaining. So why only three????