Dinner was over, and we were taking our coffee on the front portico. It was a perfect June night, the heavens a sable pall studded with innumerable star-clusters, the little vagrant breezes redolent of new mown hay, a nightingale singing in a nearby boscage. An atmosphere of heavenly peace and quiet that I must needs disturb with the blunt question:
"And now what was it that killed John Thaneford?"
Chalmers Warriner threw away the butt of his cigar. "What was it that killed all the Hildebrands throughout two generations?" he retorted. "Yardley and Randall and Horace and Richard, and Francis Graeme? The answer to the one question is the answer to them all. And, finally, there was Eunice Trevor, who went voluntarily to meet the invisible angel of death—a brave woman if there ever was one! Of course you remember the unfinished letter which she left behind her. There was a particular paragraph in it that impressed me, and I copied it down in my note-book." He pulled out the little volume and began to read:
... moreover, I believe that the heart of the Terror beats in this very place—the library of "Hildebrand Hundred." Something is in this room, something eternally menacing and eternally patient. It may be in one year or it may be in three and fifty years, but in the end it will surely claim its own. Yes, something is here, the something for which I myself am waiting; but, search as you will, you shall not find the Terror; you must await its coming. At least you may be certain that it will not fail to keep tryst.
"It must be evident," continued Chalmers, "that Eunice Trevor was aware of the very real danger attendant upon the occupation of the room we call the library at 'Hildebrand Hundred.' But she did not know what was the nature of that danger; in the same breath she speaks of the peril as being eternally menacing and eternally patient—a contradiction in terms. How could the Terror be always ready to strike, and yet, in one case at least, wait half a century for the opportunity? This discrepancy bothered me from the very first; but let me explain myself more exactly; I made some other notes at the time."
Warriner ruffled the leaves of his note-book, and began again:
"Eunice Trevor gives a list of the owners of the 'Hundred,' together with the dates of their succession and death, running back to 1860, when Yardley Hildebrand succeeded his father, Oliver; Yardley himself dying a year later under mysterious circumstances. At least I assume that they were mysterious, for Effingham has assured me that he died alone and while engaged in looking over some papers in the then newly completed library. The list continues with Randall and Horace and Richard Hildebrand, and ends with Francis Graeme. Now for Miss Trevor's comments:
"As we analyze these dates and periods we come upon some curious coincidences, and also upon some marked discrepancies. Yardley Hildebrand reigned for one brief year, and the same is true of Randall Hildebrand and of Francis Graeme. But Horace Hildebrand enjoyed three full years of sovereignty, while Richard was Hildebrand of the "Hundred" for no less a period than fifty-three years. Yet all five went to their death along an unfrequented road, and no man can say of a certainty what was the essential damnation of their taking-off. They died, and they died alone—here in this very room where I sit waiting, waiting."
Warriner lit a fresh cigar.
"Making due allowance for feminine hyperbole," he said judicially, "and for the writer's excited state of mind, we arrive at certain definite facts. Here are six deaths—seven if we include that of John Thaneford—and all of them happening under apparently natural but really abnormal conditions. The constant factors in the series of equations are the locale and the general circumstances—an unattended death and no visible cause for dissolution. The period is a variable quantity—from one to over fifty years. We therefore may conclude justifiably that Miss Trevor was wrong in her assertion about something deadly and menacing being always in the room, ready to spring upon its prey. Under that hypothesis the apartment would quickly have become impossible for human occupancy. The alternative theory is that, granting certain conditions, the lethal agent might enter the room and accomplish its deadly purpose, and then immediately withdraw. Finally, this agency might be human or purely mechanical in character. You see what I'm driving at. From the first, I believed that the attack was delivered from without, while Betty and Eunice held that it was what the police call an inside job."