A Hardy Norseman by Edna Lyall

Had it not been for the fog his long walk might have made him sleepy, but the necessity of keeping every faculty on the alert and of sharply watching every crossing and every landmark made that out of the question. Moreover, now that he had quite recovered from his illness it took a great deal to tire him, and, whenever he did succumb, it was to mental worry, never to physical fatigue. So he tramped along pretty cheerfully, rather enjoying the novelty of the thing, but making as much haste as he could on account of Sigrid. He had just reached the outer door of the model lodgings and was about to unlock it with the key which was always furnished to those whose work detained them beyond the hour of closing, when he was startled by something that sounded like a sob close by him. He paused and listened; it came again.

"Who is there? " he said, straining his eyes to pierce the thick curtain of fog that hung before him.