Lord Alloway shook his head.
‘Quite impossible—they would have had to pass him in order to do so.’
‘And Mr Fitzroy himself—you are sure of him, eh?’
Lord Alloway flushed.
‘Absolutely, M. Poirot. I will answer confidently for my secretary. It is quite impossible that he should be concerned in the matter in any way.’
‘Everything seems to be impossible,’ remarked Poirot rather drily. ‘Possibly the plans attached to themselves a little pair of wings, and flew away—comme ça!’ He blew his lips out like a comical cherub.
‘The whole thing is impossible,’ declared Lord Alloway impatiently. ‘But I beg, M. Poirot, that you will not dream of suspecting Fitzroy. Consider for one moment—had he wished to take the plans, what could have been easier for him than to take a tracing of them without going to the trouble of stealing them?’
‘There, milor’,’ said Poirot with approval, ‘you make a remark bien juste—I see that you have a mind orderly and methodical. L’Angleterre is happy in possessing you.’
Lord Alloway looked rather embarrassed by this sudden burst of praise. Poirot returned to the matter in hand.
‘The room in which you had been sitting all the evening—’
‘The drawing-room? Yes?’
‘That also has a window on the terrace, since I remember your saying you went out that way. Would it not be possible for someone to come out by the drawing-room window and in by this one while Mr Fitzroy was out of the room, and return the same way?’
‘But we’d have seen them,’ objected the Admiral.
‘Not if you had your backs turned, walking the other way.’
‘Fitzroy was only out of the room a few minutes, the time it would take us to walk to the end and back.’
‘No matter—it is a possibility—in fact, the only one as things stand.’
‘But there was no one in the drawing-room when we went out,’ said the Admiral.
‘They may have come there afterwards.’
‘You mean,’ said Lord Alloway slowly, ‘that when Fitzroy heard the maid scream and went out, someone was already concealed in the drawing-room, and that they darted in and out through the windows, and only left the drawing-room when Fitzroy had returned to this room?’
‘The methodical mind again,’ said Poirot, bowing.
‘You express the matter perfectly.’
‘One of the servants, perhaps?’
‘Or a guest. It was Mrs Conrad’s maid who screamed. What exactly can you tell me of Mrs Conrad?’
Lord Alloway considered for a minute.
‘I told you that she is a lady well known in society. That is true in the sense that she gives large parties, and goes everywhere. But very little is known as to where she really comes from, and what her past life has been. She is a lady who frequents diplomatic and Foreign Office circles as much as possible. The Secret Service is inclined to ask—why?’
‘I see,’ said Poirot. ‘And she was asked here this week-end—’
‘So that—shall we say?—we might observe her at close quarters.’
‘Parfaitement! It is possible that she has turned the tables on you rather neatly.’
Lord Alloway looked discomfited, and Poirot continued: ‘Tell me, milor’, was any reference made in her hearing to the subjects you and the Admiral were going to discuss together?’
‘Yes,’ admitted the other. ‘Sir Harry said: “And now for our submarine! To work!” or something of that sort. The others had left the room, but she had come back for a book.’
‘I see,’ said Poirot thoughtfully. ‘Milor’, it is very late—but this is an urgent affair. I would like to question the members of this house-party at once if it is possible.’
‘It can be managed, of course,’ said Lord Alloway. ‘The awkward thing is, we don’t want to let it get about more than can be helped. Of course, Lady Juliet Weardale and young Leonard are all right—but Mrs Conrad, if she is not guilty, is rather a different proposition. Perhaps you could just state that an important paper is missing, without specifying what it is, or going into any of the circumstances of the disappearance?’
‘Exactly what I was about to propose myself,’ said Poirot, beaming. ‘In fact, in all three cases. Monsieur the Admiral will pardon me, but even the best of wives—’