But after all, this was not the final phase of the matter. Reaching for his handkerchief before rising to leave, Dr Willett’s fingers closed upon a piece of paper in his pocket which had not been there before, and which was companioned by the candles and matches he had seized in the vanished vault. It was a common sheet, torn obviously from the cheap pad in that fabulous room of horror somewhere underground, and the writing upon it was that of an ordinary lead pencil – doubtless the one which had lain beside the pad. It was folded very carelessly, and beyond the faint acrid scent of the cryptic chamber bore no print or mark of any world but this. But in the text itself it did indeed reek with wonder; for here was no script of any wholesome age, but the laboured strokes of mediaeval darkness, scarcely legible to the laymen who now strained over it, yet having combinations of symbols which seemed vaguely familiar. The briefly scrawled message lent purpose to the shaken pair, who forthwith walked steadily out to the Ward car and gave orders to be driven first to a quiet dining place and then to the John Hay Library on the hill.

At the library it was easy to find good manuals of palaeography, and over these the two men puzzled till the lights of evening shone out from the great chandelier. In the end they found what was needed. The letters were indeed no fantastic invention, but the normal script of a very dark period. They were the pointed Saxon minuscules of the eighth or ninth century A.D., and brought with them memories of an uncouth time when under a fresh Christian veneer ancient faiths and ancient rites stirred stealthily, and the pale moon of Britain looked sometimes on strange deeds in the Roman ruins of Caerleon and Hexhaus, and by the towers along Hadrian’s crumbling wall. The words were in such Latin as a barbarous age might remember – ‘Corwinus necandus est. Cadaver aq(ua) forti dissolvendum, nec aliq(ui)d retinendum. Tace ut potes.’ – which may roughly be translated, ‘Curwen must be killed. The body must be dissolved in aqua fortis, nor must anything be retained. Keep silence as best you are able.’

Willett and Mr Ward were mute and baffled. They had met the unknown, and found that they lacked emotions to respond to it, as they vaguely believed they ought. With Willett, especially, the capacity for receiving fresh impressions of awe was well-nigh exhausted; and both men sat still and helpless till the closing of the library forced them to leave. Then they drove listlessly to the Ward mansion in Prospect Street, and talked to no purpose into the night. The doctor rested toward morning, but did not go home. And he was still there Sunday noon when a telephone message came from the detectives who had been assigned to look up Dr Allen.