'I did my best to argue her out of her idea, but she refused to be put off. I told her then that it would be better for her not to communicate with this office or myself unless she secured definite evidence which might give us a case against her husband's murderers because, if they learned that she had any connection with us, she might be murdered herself. But all this happened over seven weeks ago and, to tell the truth, I'd forgotten all about her till Thompson produced this photograph this morning.'

'Forgotten all about her!' Barney repeated angrily. 'Good God, Sir; I'd never have thought it of you. To let a lovely girl like her, with no experience of the game, go butting her head into a nest of the vilest crooks imaginable and never even give her a thought. . . .'

'Steady on; steady on!' Verney cut in, but his voice remained as low and even as ever. 'Don't let your sense of chivalry run away with you; and try for a moment to appreciate what it means to occupy this chair. I gave you a key role in an important mission, but you are only one of a score of my people who are engaged on it. I have to receive all their reports as well as yours. And that is only one of my jobs. I have to supervise the watch that is maintained in every port in the kingdom against undesirables entering it; I'm responsible for security in all secret Scientific Establishments; I am having at least fifty potential spies or saboteurs either hunted or kept under observation. Even that is no more than half of it. I have to attend conferences at half-a-dozen Ministries and quite frequently others that take me abroad. This afternoon, for example, I shall be flying to Bonn at the invitation of my opposite number there, for a two-day visit to compare our methods with those in use by the West German Security Services. So your suggestion that I can find the time to keep a private eye upon any young woman who elects, against my advice, to play at being an amateur detective is really rather foolish.'

'I'm sorry, Sir. I'm afraid I hadn't thought of it like that, but . . .'

'That's all right, Barney. But if you are to go up the ladder here, as you show good promise of doing, you must train yourself to keep a sense of proportion. If it is any comfort to you, I did tell Mary Morden that should she find herself in danger she was to let me know, and I would at once come to her assistance.'