A classic murder mystery.The fierce sunlight of a sultry afternoon in the early part of July forced its way through every crevice and cranny of the closely drawn shutters in the luxurious private offices of Mainwaring & Co., Stock Brokers, and slender shafts of light, darting here and there, lent a rich glow of color to the otherwise subdued tones of the elegant apartments. A glance at the four occupants of one of these rooms, who had disposed themselves in various attitudes according to their individual inclinations, revealed the fact that three out of the four were Englishmen, while the fourth might have been denominated as a typical American from the professional class. Of rather slender form, with a face of rare sensitiveness and delicacy, and restless, penetrating eyes, his every movement indicated energy and alertness. On the present occasion he had little to say, but was engaged in listening attentively to the conversation of the others