She was as good as her word, but there was nothing which was helpful in our investigation. She had no reason to think that her fiance had any hidden enemy, but she admitted that she had had several warm admirers.

“May I ask if Mr. Ian Murdoch was one of them?”

She blushed and seemed confused.

“There was a time when I thought he was. But that was all changed when he understood the relations between Fitzroy and myself.”

Again the shadow round this strange man seemed to me to be taking more definite shape. His record must be examined. His rooms must be privately searched. Stackhurst was a willing collaborator, for in his mind also suspicions were forming. We returned from our visit to The Haven with the hope that one free end of this tangled skein was already in our hands.

A week passed. The inquest had thrown no light upon the matter and had been adjourned for further evidence. Stackhurst had made discreet inquiry about his subordinate, and there had been a superficial search of his room, but without result. Personally, I had gone over the whole ground again, both physically and mentally, but with no new conclusions. In all my chronicles the reader will find no case which brought me so completely to the the limit of my powers. Even my imagination could conceive no solution to the mystery. And then there came the incident of the dog.

It was my old housekeeper who heard of it first by that strange wireless by which such people collect the news of the countryside.

“Sad story this, sir, about Mr. McPherson’s dog,” said she one evening.

I do not encourage such conversations, but the words arrested my attention.

“What of Mr. McPherson’s dog?”

“Dead, sir. Died of grief for its master.”

“Who told you this?”

“Why, sir, everyone is talking of it. It took on terrible, and has eaten nothing for a week. Then to-day two of the young gentlemen from The Gables found it dead — down on the beach, sir, at the very place where its master met his end.”

“At the very place.” The words stood out clear in my memory. Some dim perception that the matter was vital rose in my mind. That the dog should die was after the beautiful, faithful nature of dogs. But “in the very place”! Why should this lonely beach be fatal to it? Was it possible that it also had been sacrificed to some revengeful feud? Was it possible —? Yes, the perception was dim, but already something was building up in my mind. In a few minutes I was on my way to The Gables, where I found Stackhurst in his study. At my request he sent for Sudbury and Blount, the two students who had found the dog.

“Yes, it lay on the very edge of the pool,” said one of them. “It must have followed the trail of its dead master.”

I saw the faithful little creature, an Airedale terrier, laid out upon the mat in the hall. The body was stiff and rigid, the eyes projecting, and the limbs contorted. There was agony in every line of it.

The Growler and the Masher were waiting for him in the drawing-room of the Hotel Franklin, a small family-hotel near the Trocadero. Mme. Mergy had not yet written to him.

"Oh," he said, "I can trust her! She will hang on to Daubrecq until she is certain."

However, toward the end of the afternoon, he began to grow impatient and anxious. He was fighting one of those battles - the last, he hoped - in which the least delay might jeopardize everything. If Daubrecq threw Mme. Mergy off the scent, how was he to be caught again? They no longer had weeks or days, but only a few hours, a terribly limited number of hours, in which to repair any mistakes that they might commit.

He saw the proprietor of the hotel and asked him:

"Are you sure that there is no express letter for my two friends?"

"Quite sure, sir."

"Nor for me, M. Nicole?"

"No, sir."

"That's curious," said Lupin. "We were certain that we should hear from Mme. Audran."

Audran was the name under which Clarisse was staying at the hotel.

"But the lady has been," said the proprietor.

"What's that?"

"She came some time ago and, as the gentlemen were not there, left a letter in her room. Didn't the porter tell you?"

Lupin and his friends hurried upstairs. There was a letter on the table.

"Hullo!" said Lupin. "It's been opened! How is that? And why has it een cut about with scissors?"

The letter contained the following lines:

"Daubrecq has spent the week at the Hotel Central. This morning he had his luggage taken to the Gare de --- and telephoned to reserve a berth in the sleeping-car --- for ---

"I do not know when the train starts. But I shall be at the station all the afternoon. Come as soon as you can, all three of you. We will arrange to kidnap him."

"What next?" said the Masher. "At which station? And where's the sleeping-car for? She has cut out just the words we wanted!"

"Yes," said the Growler. "Two snips with the scissors in each place; and the words which we most want are gone. Who ever saw such a thing? Has Mme. Mergy lost her head?"

Lupin did not move. A rush of blood was beating at his temples with such violence that he glued his fists to them and pressed with all his might. His fever returned, burning and riotous, and his will, incensed to the verge of physical suffering, concentrated itself upon that stealthy enemy, which must be controlled then and there, if he himself did not wish to be irretrievably beaten.

He muttered, very calmly:

"Daubrecq has been here."

"Daubrecq!"

"We can't suppose that Mme. Mergy has been amusing herself by cutting out those two words. Daubrecq has been here. Mme. Mergy thought that she was watching him. He was watching her instead."

"How?"

"Doubtless through that hall-porter who did not tell us that Mme. Mergy had been to the hotel, but who must have told Daubrecq. He came. He read the letter. And, by way of getting at us, he contented himself with cutting out the essential words."

"We can find out... we can ask... "