The first two seasons (and also the first two SP episodes) had been *absolutely* brilliant, but then the following SPs and the third season had been, in all fairness, weaker and weaker. It was therefore unexpected, but luckily this "Final Series" basically went back to the series' roots: a brilliant script with elaborate plots that worked like clockworks, the correct amount of comic relief (that is, minimal doses, so as not to become obnoxious), and most of all a tremendously satisfying mystery part (even avid fans of the genre, who are therefore used to all the tricks of the trade and are hardly ever surprised by crime writers' twists and turns, will probably be pleased - at least, so was I ^__^).