The sound came from a squat stone church of manifestly later date than most of the houses, built in a clumsy Gothic fashion and having a disproportionately high basement with shuttered windows. Though the hands of its clock were missing on the side I glimpsed, I knew that those hoarse strokes were tolling the hour of eleven. Then suddenly all thoughts of time were blotted out by an onrushing image of sharp intensity and unaccountable horror which had seized me before I knew what it really was. The door of the church basement was open, revealing a rectangle of blackness inside. And as I looked, a certain object crossed or seemed to cross that dark rectangle; burning into my brain a momentary conception of nightmare which was all the more maddening because analysis could not shew a single nightmarish quality in it.