«But it is all. When his man came to call him he wasn't there. The bed had been slept in. His pyjamas and all his clothes were there, the only odd thing being that they were thrown rather untidily on the ottoman at the foot of the bed, instead of being neatly folded on a chair, as is Sir Reuben's custom — looking as though he had been rather agitated or unwell. No clean clothes were missing, no suit, no boots — nothing. The boots he had worn were in his dressing-room as usual. He had washed and cleaned his teeth and done all the usual things. The housemaid was down cleaning the hall at half-past six, and can swear that nobody came in or out after that. So one is forced to suppose that a respectable middle-aged Hebrew financier either went mad between twelve and six a. m. and walked quietly out of the house in his birthday suit on a November night, or else was spirited away like the lady in the 'Ingoldsby Legends, body and bones, leaving only a heap of crumpled clothes behind him.»

«Was the front door bolted?»

«That's the sort of question you would ask, straight off; it took me an hour to think of it. No; contrary to custom, there was only the Yale lock on the door. On the other hand, some of the maids had been given leave to go to the theatre, and Sir Reuben may quite conceivably have left the door open under the impression they had not come in. Such a thing has happened before.»

«And that's really all?»

«Really all. Except for one very trifling circumstance.»

«I love trifling circumstances,» said Lord Peter, with childish delight; «so many men have been hanged by trifling circumstances. What was it?»

«Sir Reuben and Lady Levy, who are a most devoted couple, always share the same room. Lady Levy, as I said before, is in Mentone at the moment for her health. In her absence, Sir Reuben sleeps in the double bed as usual, and invariably on his own side — the outside — of the bed. Last night he put the two pillows together and slept in the middle, or, if anything, rather closer to the wall than otherwise. The housemaid, who is a most intelligent girl, noticed this when she went up to make the bed, and, with really admirable detective instinct, refused to touch the bed or let anybody else touch it, though it wasn't till later that they actually sent for the police.»

«Was nobody in the house but Sir Reuben and the servants?»

«No; Lady Levy was away with her daughter and her maid. The valet, cook, parlourmaid, housemaid and kitchenmaid were the only people in the house, and naturally wasted an hour or two squawking and gossiping. I got there about ten.»

«What have you been doing since?»