I confess that the young man's naturalness and confidence staggered me, the more so as I saw by the sarcastic smile on Hale's lips that he did not believe a single word spoken. A portable telephone stood on the table, and as Macpherson finished his explanation, he reached over and drew it towards him. Then Spenser Hale interfered.

'Excuse me,' he said, 'I'll do the telephoning. What is the call number of Mr. Summertrees?'

'140 Hyde Park.'

Hale at once called up Central, and presently was answered from Park Lane. We heard him say,—

'Is this the residence of Mr. Summertrees? Oh, is that you, Podgers? Is Mr. Summertrees in? Very well. This is Hale. I am in Valmont's flat—Imperial Flats—you know. Yes, where you went with me the other day. Very well, go to Mr. Summertrees, and say to him that Mr Macpherson wants the encyclopaedia for 1893. Do you get that? Yes, encyclopaedia. Oh, he'll understand what it is. Mr. Macpherson. No, don't mention my name at all. Just say Mr. Macpherson wants the encyclopaedia for the year 1893, and that you are to bring it. Yes, you may tell him that Mr. Macpherson is at Imperial Flats, but don't mention my name at all. Exactly. As soon as he gives you the book, get into a cab, and come here as quickly as possible with it. If Summertrees doesn't want to let the book go, then tell him to come with you. If he won't do that, place him under arrest, and bring both him and the book here. All right. Be as quick as you can; we're waiting.'

Macpherson made no protest against Hale's use of the telephone; he merely sat back in his chair with a resigned expression on his face which, if painted on canvas, might have been entitled 'The Falsely Accused.' When Hale rang off, Macpherson said,—

'Of course you know your own business best, but if your man arrests Summertrees, he will make you the laughing-stock of London. There is such a thing as unjustifiable arrest, as well as getting money under false pretences, and Mr. Summertrees is not the man to forgive an insult. And then, if you will allow me to say so, the more I think over your absent-minded theory, the more absolutely grotesque it seems, and if the case ever gets into the newspapers, I am sure, Mr Hale, you'll experience an uncomfortable half-hour with your chiefs at Scotland Yard.'

'I'll take the risk of that, thank you,' said Hale stubbornly.

'Am I to consider myself under arrest?' inquired the young man.

'No, sir.'