Secondly, when was it done? Thirdly, where was it done? I have left out a possible fourth, why was it done? because, in this case, I think that the motive and the man are practically identical. I mean that if you discover one, you discover the other."

Heneage leaned across the table towards the Colonel.

"You are a magician, Colonel," he declared quietly. "I glanced through this case in the paper, and it did not even interest me. Since I have listened to you I have fallen under the spell of the mysterious. Have you any theories?"

The Colonel's face fell a little.

"Well, I am afraid not," he admitted regretfully. "To be perfectly interesting the affair certainly ought to present something more definite in the shape of a clue. You see, providing we accept the evidence of Wrayson and the cabman, and I suppose," he added, laying his hand affectionately upon Wrayson's shoulder, "we must, the actual murderer is a person absolutely unseen or unheard of by any one. If you are all really interested we will discuss it again in a week's time after the adjourned inquest."

"I, for one, shall look forward to it," Heneage remarked, glancing across towards Wrayson. "What about a pool?"

"I'm on," Wrayson declared, rising a little abruptly.

"And I," Mason assented.

"And I can't," the Colonel said regretfully. "I must go down to Balham and see poor Carlo Mallini; I hear he's very queer."

The Colonel loved pool, and he hated a sick-room. The click of the billiard balls reached him as he descended the stairs, but he only sighed and set out manfully for Charing Cross. On the way he entered a fruiterer's shop and inquired the price of grapes. They were more than he expected, and he counted out the contents of his trousers pockets before purchasing.

"A little short of change," he remarked cheerfully. "Yes! all right, I'll take them."

He marched out, swinging a paper bag between his fingers, travelled third class to Balham, and sat for a couple of hours with the invalid whom he had come to see, a lonely Italian musician, to whom his coming meant more than all the medicine his doctor could prescribe. He talked to him glowingly of the success of his recent concert (more than a score of the tickets sold had been paid for secretly by the Colonel himself and his 

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