and I was to get from him whether the thing suggested was anyway possible.’
‘And was it?’ I asked eagerly.
‘That’s just what I don’t know. I haven’t seen Mr Halliday—and I’m not likely to, by all accounts.’
‘The truth of the matter is,’ said Japp shortly, ‘Halliday’s disappeared.’
‘When?’
‘Two months ago.’
‘Was his disappearance reported?’
‘Of course it was. His wife came to us in a great state. We did what we could, but I knew all along it would be no good.’
‘Why not?’
‘Never is—when a man disappears that way.’ Japp winked.
‘What way?’
‘Paris.’
‘So Halliday disappeared in Paris?’
‘Yes. Went over there on scientific work—so he said. Of course, he’d have to say something like that. But you know what it means when a man disappears over there. Either it’s Apache work, and that’s the end of it; or else it’s voluntary disappearance—and that’s a great deal the commoner of the two, I can tell you. Gay Paree and all that, you know. Sick of home life. Halliday and his wife had had a tiff before he started, which all helps to make it a pretty clear case.’
‘I wonder,’ said Poirot thoughtfully.
The American was looking at him curiously.
‘Say, mister,’ he drawled, ‘what’s this Big Four idea?’
‘The Big Four,’ said Poirot, ‘is an international organisation which has at its head a Chinaman. He is known as Number One. Number Two is an American. Number Three is a Frenchwoman. Number Four, the “Destroyer”, is an Englishman.’
‘A Frenchwoman, eh?’ The American whistled. ‘And Halliday disappeared in France. Maybe there’s something in this. What’s her name?’
‘I don’t know. I know nothing about her.’
‘But it’s a mighty big proposition, eh?’ suggested the other.
Poirot nodded, as he arranged the glasses in a neat row on the tray. His love of order was as great as ever.
‘What was the idea in sinking those boats? Are the Big Four a German stunt?’
‘The Big Four are for themselves—and for themselves only, M. le Capitaine. Their aim is world domination.’
The American burst out laughing, but broke off at the sight of Poirot’s serious face.
‘You laugh, monsieur,’ said Poirot, shaking a finger at him. ‘You reflect not—you use not the little grey cells of the brain. Who are these men who send a portion of your Navy to destruction simply as a trial of their power? For that was all it was, monsieur—a test of this new force of magnetical attraction which they hold.’
‘Go on with you, moosior!’ said Japp good-humouredly. I’ve read of super criminals many a time, but I’ve never come across them. Well, you’ve heard Captain Kent’s story. Anything further I can do for you?’
‘Yes, my good friend. You can give me the address of Mrs Halliday—and also a few words of introduction to her, if you will be so kind.’
Thus it was that the following day saw us bound for Chetwynd Lodge, near the village of Chobham, in Surrey.
Mrs Halliday received us at once—a tall, fair woman, nervous and eager in manner. With her was her little girl, a beautiful child of five.
Poirot explained the purpose of our visit.
‘Oh, Monsieur Poirot, I am so glad, so thankful! I have heard of you, of course. You will not be like these Scotland Yard people who will not listen or try to understand. And the French police are just as bad—worse, I think. They are all convinced that my husband has gone off with some other woman. But he wasn’t like that! All he thought of in life was his work. Half our quarrels came from that. He cared for it more than he did for me.’
‘Englishmen, they are like that,’ said Poirot soothingly. ‘And if it is not work, it is the games, the sport. All those things they take au grand sérieux. Now, madame, recount to me exactly, in detail, and as methodically as you can, the exact circumstances of your husband’s disappearance.’
‘My husband went to Paris on Thursday, the 20th of July. He was to meet and visit various people there connected with his work, amongst them Madame Olivier.’
Poirot nodded at the mention of the famous French woman chemist, who had eclipsed even Madame Curie in the brilliance of her achievements. She had been decorated by the French Government, and was one of the most prominent personalities of the day.
‘He arrived there in the evening, and went at once to the Hotel Castiglione in the Rue de Castiglione. On the following morning he had an appointment with Professor Bourgoneau, which he kept. His manner was normal and pleasant. The two men had a most interesting conversation, and it was arranged that he should witness some experiments in the professor’s laboratory on the following day. He lunched alone at the Café Royal, went for a walk in the Bois, and then visited Madame Olivier at her house at Passy. There, also, his manner was perfectly normal. He left about six. Where he dined is not known—probably alone at some restaurant. He returned to the hotel about eleven o’clock and went straight up to his room, after inquiring if any letters had come for him. On the following morning he walked out of the hotel, and has not been seen again.’
‘At what time did he leave the hotel? At the hour when he would normally leave it to keep his appointment at Professor Bourgoneau’s laboratory?’
‘We do not know. He was not remarked leaving the hotel. But no petit déjeuner was served to him, which seems to indicate that he went out early.’
‘Or he might, in fact, have gone out again after he came in the night before?’
‘I do not think so. His bed had been slept in, and the night porter would have remembered anyone going out at that hour.’
‘A very just observation, madame. We may take it, then, that he left early on the following morning—and that is reassuring from one point of view. He is not likely to have fallen a victim to any Apache assault at that hour. His baggage, now, was it all left behind?’
Mrs Halliday seemed rather reluctant to answer, but at last she said:
‘No—he must have taken one small suitcase with him.’
‘H’m,’ said Poirot thoughtfully, ‘I wonder where he was that evening. If we knew that, we should know a great deal. Whom did he meet?—there lies the mystery. Madame, myself I do not of necessity accept the view of the police; with them is it always “Cherchez la femme”. Yet it is clear that something occurred that night to alter your husband’s plans. You say he asked for letters on returning to the hotel. Did he receive any?’
‘One
