What's good and what's not so good about The Tunnel

The British-French co-production, The Tunnel (Season 1), is one of the several adaptations of the Scandinavian series The Bridge (which I haven't seen), a 10-epiosde pursuit of a maniacal terrorist/serial killer undertaken jointly by the UK and French police forces. I an't call it a great series, though it rises above most in that it held our interest over its whole 10-episode span. First of all, on the plus side, the best aspect of the movie is the interaction and the developing respect and friendship between the two lead cops, the British Karl, an older, seasoned, police detective with serious family issues, and the younger French detective, Elise Wasserman, single and singularly focused on her work and suffering from - though it's never named as such - what appear to be a form of Asperger's syndrome: She literally cannot utter a lie in that she can't imagine the social codes of etiquette that govern most of our lives, and she is always deadly serious about everything in her work and her private life. Slowly, and credibly, we watch her grow over the course of the season. Another highlight are a few scenes of real tension, particularly regarding bombs and incendiary devices; this series was a predecessor of and in influence on other terrorist programs, such as the recent The Bodyguard. That said, on the other hand we soon realize that each episode will highlight a potential suspect and then eliminate, often literally, him or her - so we sense (correctly) - spoilers here! - that we will never be able to guess the ID of the terrorist as we don't even see him till late in the season. Further, the terrorist's activities are preposterous on every level; no one person could plan and carry out such elaborate killings, all of them widely publicized - and if one person could do so there would be so many clues and security footage that the crimes would be solved quickly. Finally, though Karl's family is toward the end put in jeopardy, their behavior when under threat is so ridiculous and stupid that you just want to throw up your hands in disbelief. So to watch this series you have to just say the hell w/ it, I'll accept anything, and just enjoy the pacing and the sensitive character development, of which there is plenty. Obviously, there are threads untied at the end, as The Tunnel revs up for a second season (which I won't watch).