Then, without warning, I saw the intermittent flashes of light on the distant reef. They were definite and unmistakable, and awaked in my mind a blind horror beyond all rational proportion. My muscles tightened for panic flight, held in only by a certain unconscious caution and half-hypnotic fascination. And to make matters worse, there now flashed forth from the lofty cupola of the Gilman House, which loomed up to the northeast behind me, a series of analogous though differently spaced gleams which could be nothing less than an answering signal.