"We will go back to the note which was handed in to Garcia upon the evening of his death. We may put aside this idea of Baynes's that Garcia's servants were concerned in the matter. The proof of this lies in the fact that it was he who had arranged for the presence of Scott Eccles, which could only have been done for the purpose of an alibi. It was Garcia, then, who had an enterprise, and apparently a criminal enterprise, in hand that night in the course of which he met his death. I say 'criminal' because only a man with a criminal enterprise desires to establish an alibi. Who, then, is most likely to have taken his life? Surely the person against whom the criminal enterprise was directed. So far it seems to me that we are on safe ground.
"We can now see a reason for the disappearance of Garcia's household. They were all confederates in the same unknown crime. If it came off when Garcia returned, any possible suspicion would be warded off by the Englishman's evidence, and all would be well. But the attempt was a dangerous one, and if Garcia did not return by a certain hour it was probable that his own life had been sacrificed. It had been arranged, therefore, that in such a case his two subordinates were to make for some prearranged spot where they could escape investigation and be in a position afterwards to renew their attempt. That would fully explain the facts, would it not?"
The whole inexplicable tangle seemed to straighten out before me. I wondered, as I always did, how it had not been obvious to me before.
"But why should one servant return?"
"We can imagine that in the confusion of flight something precious, something which he could not bear to part with, had been left behind. That would explain his persistence, would it not?"
"Well, what is the next step?"
"The next step is the note received by Garcia at the dinner. It indicates a confederate at the other end. Now, where was the other end? I have already shown you that it could only lie in some large house, and that the number of large houses is limited. My first days in this village were devoted to a series of walks in which in the intervals of my botanical researches I made a reconnaissance of all the large houses and an examination of the family history of the occupants. One house, and only one, riveted my attention. It is the famous old Jacobean grange of High Gable, one mile on the farther side of Oxshott, and less than half a mile from the scene of the tragedy. The other mansions belonged to prosaic and respectable people who live far aloof from romance. But Mr. Henderson, of High Gable, was by all accounts a curious man to whom curious adventures might befall. I concentrated my attention, therefore, upon him and his household.
"A singular set of people, Watson the man himself the most singular of them all. I managed to see him on a plausible pretext, but I seemed to read in his dark, deep-set, brooding eyes that he was perfectly aware of my true business. He is a man of fifty, strong, active, with iron-gray hair, great bunched black eyebrows, the step of a deer, and the air of an emperor a fierce, masterful man, with a red-hot spirit behind his parchment face. He is either a foreigner or has lived long in the tropics, for he is yellow and sapless, but tough as whipcord. His friend and secretary, Mr. Lucas, is undoubtedly a foreigner, chocolate brown, wily, suave, and catlike, with a poisonous gentleness of speech. You see, Watson, we have come already upon two sets of foreigners one at Wisteria Lodge and one at High Gable so our gaps are beginning to close.
"These two men, close and confidential friends, are the center of the household; but there is one other person who for our immediate purpose may be even more important. Henderson has two children girls of eleven and thirteen. Their governess is a Miss Burnet, an Englishwoman of forty or thereabouts. There is also one confidential manservant. This little group forms the real family, for they travel about together, and Henderson is a great traveler, always on the move. It is only within the last few weeks that he has returned, after a year's absence, to High Gable. I may add that he is enormously rich, and whatever his whims may be he can very easily satisfy them. For the rest, his house is full of butlers, footmen, maidservants, and the usual overfed, underworked staff of a large English country-house.
"So much I learned partly from village gossip and partly from my own observation. There are no better instruments than discharged servants with a grievance, and I was lucky enough to find one. I call it luck, but it would not have come my way had I not been looking out for it. As Baynes remarks, we all have our systems. It was my system which enabled me to find John Warner, late gardener of High Gable, sacked in a moment of temper by his imperious employer. He in turn had friends among the indoor servants who unite in their fear and dislike of their master. So I had my key to the secrets of the establishment.
"Curious people, Watson! I don't pretend to understand it all yet, but very curious people anyway. It's a double-winged house and the servants live on one side, the family on the other. There's no link between the two save for Henderson's own servant, who serves the family's meals. Everything is carried to a certain door, which forms the one connection. Governess and children hardly go out at all, except into the garden. Henderson never by any chance walks alone. His dark secretary is like his shadow. The gossip among the servants is that their master is terribly afraid of something. 'Sold his soul to the devil in exchange for money,' says Warner, 'and expects his creditor to come up and claim his own.' Where they came from, or who they are, nobody has an idea. They are very violent. Twice Henderson has lashed at folk with his dog-whip, and only his long purse and heavy compensation have kept him out of the courts.
"Well, now, Watson, let us judge the situation by this new information. We may take it that the letter came out of this strange household and was an invitation to Garcia to carry out some attempt which had already been planned. Who wrote the note? It was someone within the citadel, and it was a woman. Who then but Miss Burnet, the governess? All our reasoning seems to point that way. At any rate, we may take it as a hypothesis and see what consequences it would entail. I may add that Miss Burnet's age and character make it certain that my first idea that there might be a love interest in our story is out of the question.
"If she wrote the note she was presumably the friend and confederate of Garcia. What, then, might she be expected to do if she heard of his death? If he met it in some nefarious enterprise her lips might be sealed. Still, in her heart, she must retain bitterness and hatred against those who had killed him and would presumably help so far as she could to have revenge upon them. Could we see her, then, and try to use her? That was my first thought. But now we come to a sinister fact. Miss Burnet has not been seen by any human eye since the night of the murder. From that evening she has utterly vanished. Is she alive? Has she perhaps met her end on the same night as the friend whom she had summoned? Or is she merely a prisoner? There is the point which we still have to decide.
"You will appreciate the difficulty of the situation, Watson. There is nothing upon which we can apply for a warrant. Our whole scheme might seem fantastic if laid before a magistrate. The woman's disappearance counts for nothing, since in that extraordinary household any member of it might be invisible for a week. And yet she may at the present moment be in danger of her life. All I can do is to watch the house and leave my agent, Warner, on guard at the gates. We can't let such a situation continue. If the law can do nothing we must take the risk ourselves."