The Fog Princes by Florence Warden

Sep was the first to recover consciousness. Little by little, beginning by half-opening his eyes in the darkness only to shut them again, without thought, without memory, he at last woke with a start to the knowledge that he was lying on something very hard, in a cold, dark place, that his teeth were chattering, and that he was very badly bruised on his right arm and side. Then, turning, he saw the pale remains of the daylight, or the pale beginnings of the moonlight, coming through the deep embrasure of the window. Following the line of faint light with eyes in which the intelligence was scarcely yet awake, he saw on the floor, almost close to him, what looked like a tumbled heap of dark clothes.

Then he remembered. Shaking off the stupor, which again seemed to be overpowering him, Sep turned his friend's body so that he could dimly see the face. At first he thought he was dead, and with a shriek of horror Sep started to his feet. But Rees stirred at the sound, and in a moment his friend was again beside him, loosening his clothes, watching eagerly the first faint signs of returning life, and muttering curses on his own weakness in having helped him in this dangerous, mad enterprise. At last Rees, after uttering a few faint sighs, rolled over on his left side, and again his companion thought he was dying, if not dead.