SPOILERS - how it ends - SPOILERS
This was very enjoyable, mostly for the performances of Lorre and Greenstreet, but also the atmosphere and the storyline were good. However, when all is revealed, although it's a fun idea, it really doesn't make a lot of sense. We're to believe that Greenstreet ruined the career (and essentially, the life) of a Member of Parliament, and sent him to prison wrongfully for a period of months, simply to make the new Superintendant look bad? That's REALLY evil and out of character, and in the end he muses how he didn't really do anything terribly wrong.
"Now let's have an intelligent conversation. I'll talk and you listen."