Dangerous Knowledge

Old fashioned enjoyable thriller, how they used to make them. Action but without gratuitous sex or profanity. Anyway John Gregson would never indulge in such things! The "Dangerous Knowledge" is teasingly kept secret from us until very near the end. All we know is that Kirby (Gregson) has learned something which is of national importance. However he is quite prepared to put a price on this information. This leads to him being followed by shady agent Ralph Bates who is working for government bigwig Patrick Allen. Is he the subject of the secret, or is it someone else? Is the girl Laura what she seems? Lots of unexplained goings on, mysterious deaths and suchlike. Very Cold War, with the emphasis on not taking anything at face value. The tension and mystery build up intriguingly, to the extent that, ha ving recorded the series, I ended up watching the final three episodes one after the other.