It was on one of the hottest nights of that unusually hot September that Mrs. Thornton gave a dance. The moist, lifeless air enveloped the earth like a heavy cloak and even the carefully shaded lights failed to conceal the lines of heat-weariness in the jaded faces of the guests. To Evelyn Thornton, in whose honour the affair was ostensibly held, the feverish rooms presently became unbearable, and abandoning the arduous duties of hostess to her mother and her younger and more energetic sister Mabel, she took refuge in the darkness of the small easterly veranda overlooking the beach.