Sax Rohmer

“ There is a courage which is not physical, nor is it entirely moral; a courage often lacking in the most intrepid soldier. And this was the kind of courage which Robert Cairn now called up to his aid. The occult inquirer can face, unmoved, horrors which would turn the brain of many a man who wears the V.C.; on the other hand it is questionable if the possessor of this peculiar type of bravery could face a bayonet charge. Pluck of the physical sort, Cairn had in plenty; pluck of that more subtle kind he was acquiring from growing intimacy with the terrors of the Borderland. ”

“ For terrors, he had been prepared—for some gruesome shape such as we read of in The Magus. But there was nothing. Instinctively he had looked straight ahead of him, as one looks who expects to encounter a human enemy. But the hall-way was empty. A dim light, finding access over the door from the stair, prevailed there, yet, it was sufficient to have revealed the presence of anyone or anything, had anyone or anything been present.
Cairn stepped out from the room and was about to walk to the outer door. The idea of flight was strong upon him, for no man can fight the invisible ”

“ The light pouring out from beneath the shade of the table-lamp scarcely touched upon the door at all. Only the edges of the lower panels were clearly perceptible; the upper part of the door was masked in greenish shadow.
Intent, tensely strung, he stood; then advanced in the direction of the switch in order to light the lamp fixed above the mantel-piece and to illuminate the whole of the room. One step forward he took, then ... the soft rapping was repeated.
"Who's there?" ”