"Bullard, I wish to say that I refuse to take more of the diamonds than will just pay my debts."

"A thousand thanks, old chap, but I really cannot accept such generosity." Bullard threw out his hand. "Yonder are the houses, and you will perceive that the doctor has not yet retired--to bed. Christopher's, however, looks less hospitable. Never mind! We can take turns at pushing the b.u.t.ton."

"Bullard, for Heaven's sake, let us respect the--the dead."

"And let us refrain from hypocrisies. Come along, man!"

In silence they came to the gates, where Bullard spoke--

"Now remember, all you've got to do is to follow my lead, and not take fright at anything. Caw may not be alone in the house. It is even possible that he may have the company of some wretched lawyer fellow who has been nosing around all day. Come, buck up! You'll feel fitter after a drink. Allons!"

Taking Lancaster by the elbow, he led him up the gravel path, leaves rustling about their feet. They mounted the three broad steps to the closed outer door, and, with a muttered "Here's luck!" Bullard rung the electric bell.

"Good!" he exclaimed a few seconds later, as a flood of light poured from the fan-light.

They heard the inner door being opened; then with the minimum of noise, a large key was turned, and half of the outer door swung inwards. The late Mr. Craig's servant, in his customary black lounge suit, stood there regarding them quite calmly.

Bullard had expected at least a word of astonishment, so that there was a little pause until his own words arrived.

"Good evening, Caw," he said gravely. "We very much regret to disturb you at this hour, and at this tragic time, but our business is of the utmost importance. May we have a word with you?"

Still silent, the servant stood aside, and they entered.

Said Bullard--"I need not say that we were both greatly shocked by your wire this morning. I trust our old friend did not suffer much."

"Too much, sir," answered Caw quietly, turning from closing the door. His countenance had a bleak look; his eyes were heavy. He stepped past them and opened a door on the right, switching on the lights inside. "This way, if you please, gentlemen."

Lancaster showed a momentary hesitation, or confusion, but Bullard touched his arm and he accepted the invitation.

Caw followed them a couple of paces into the room and stood at attention.

The two visitors remained standing, their hats in their hands.

Bullard had foreseen a hundred difficulties, but strangely enough, he had never thought of not being admitted to the right room. Nevertheless, his chagrin was not apparent.

"A few words will explain our unseasonable call," he said pleasantly.

"Our visit yesterday afternoon was partly of a business nature, and we brought for Mr. Craig's inspection a number of doc.u.ments which, after perusal, he returned to us--as it seemed at the time. But in the train, late at night, we discovered we were one short. And that doc.u.ment is of such vital importance that we left London again this morning, and have regretfully disturbed you now. As a matter of fact, it was a pale green share certificate in our joint names--Mr. Lancaster's and mine--and as we have sold the shares and have to deliver them two days hence, you will probably understand the necessity of recovering it immediately. Possibly you have come across such a doc.u.ment in the room upstairs?"

"No, sir."

"Ah! I suppose Mr. Craig's legal man was here today?"

"No, sir."

"Then nothing has been disturbed?"

"No, sir."

"You will, I hope, excuse these questions, Caw? We are considerably hara.s.sed about the matter. Will you tell us whether there were many loose papers on Mr. Craig's table last night?"

"None, sir."

"Then he must have tidied up after we left?"

"Yes, sir."

Bullard gave a tiny cough and glanced at Lancaster, who immediately said in a somewhat recitative fashion:

"I stick to my theory, Bullard, that Mr. Craig, in placing some of his own papers in a green metal box, placed ours along with them."

Bullard turned to the servant with a frank look of appeal. "A green metal box. Can you help us, Caw?"

It was on Caw's tongue to reply "No, sir." But in that moment, as it does with most of us at times, vanity pushed aside discretion. "Yes, sir," he answered. "I was the last to see inside that box, closing it at Mr.

Craig's request, and I can a.s.sure you there were no papers in it."

"Wrong again, Lancaster!" Bullard lightly remarked. Then gravely--"The matter is so serious, Caw, that I must ask you who has charge of the papers and so on upstairs?"

"I, sir."

"And to whom are you responsible?"

"My master and Mr. Alan Craig--till the clock stops, sir."

After a moment's pause Bullard said--"Yes, of course, we are aware that all here was gifted to Mr. Alan; also Mr. Craig mentioned the clock. But now, would you have any objections to taking us upstairs, on the chance that our doc.u.ment is lying about where we were sitting?"

Caw considered quickly. To his mind, their story had been d.a.m.ned by the mention of the Green Box; at the same time, he was quite aware that they had only to persist in their story to obtain legal authority to search the room upstairs, and his master had commanded "no police interference."

He felt pretty confident, too, that they would hardly attempt to play the burglar game in his presence, but he was curious to see how far they would go, and he was not unarmed.

"Be so good as to follow me, gentlemen," he said in his stiff way, and led them in the desired direction.

The master's room, though fireless, was warm. In silence they entered, their footfalls soundless on the heavy carpet.

Bullard halted in front of the clock with its flashing pendulum. "Is this what he spoke of," he enquired softly, "and when does it stop?"

The servant cleared his throat. "A year to-night, sir."

"Ah! ... And why this--and this?" He pointed first to the ebony slip, then to the green fluid.

"To prevent its being interfered with; also, no doubt to protect the jewels in the pendulum."

"Is it the liquid that is dangerous?"

"So I understand, sir."

"Poison?--explosive?"

"I could not say, sir."

Bullard turned to Lancaster, who had sunk into a chair, then back to the servant.