Whether the dreams brought on the fever or the fever brought on the dreams Walter Gilman did not know. Behind everything crouched the brooding, festering horror of the ancient town, and of the mouldy, unhallowed garret gable where he wrote and studied and wrestled with flgures and formulae when he was not tossing on the meagre iron bed. His ears were growing sensitive to a preternatural and intolerable degree, and he had long ago stopped the cheap mantel clock whose ticking had come to seem like a thunder of artillery. At night the subtle stirring of the black city outside, the sinister scurrying of rats in the wormy partitions, and the creaking of hidden timbers in the centuried house, were enough to give him a sense of strident pandemonium. The darkness always teemed with unexplained sound — and yet he sometimes shook with fear lest the noises he heard should subside and allow him to hear certain other fainter noises which he suspected were lurking behind them.

He was in the changeless, legend-haunted city of Arkham, with its clustering gambrel roofs that sway and sag over attics where witches hid from the King's men in the dark, olden years of the Province. Nor was any spot in that city more steeped in macabre memory than the gable room which harboured him — for it was this house and this room which had likewise harboured old Keziah Mason, whose flight from Salem Gaol at the last no one was ever able to explain. That was in 1692 — the gaoler had gone mad and babbled of a small white-fanged furry thing which scuttled out of Keziah's cell, and not even Cotton Mather could explain the curves and angles smeared on the grey stone walls with some red, sticky fluid.

Possibly Gilman ought not to have studied so hard. Non-Euclidean calculus and quantum physics are enough to stretch any brain, and when one mixes them with folklore, and tries to trace a strange background of multi-dimensional reality behind the ghoulish hints of the Gothic tales and the wild whispers of the chimney-corner, one can hardly expect to be wholly free from mental tension.