Every other disclosure of the KGB defector has been accurate, guaranteeing the most vital revelation of all, that an assassin has been despatched to assassinate a British politician. The information is limited, though. There's no clue to the identity of the killer. Or his victim. Or how the murder is to be committed. Or where. Or when. What do you want me to do? asks Charlie. Find out and stop it, is the unsurprising reply.