813 CHAPTER I THE TRAGEDY AT THE PALACE HOTEL Mr. Kesselbach stopped short on the threshold of the sitting-room, took his secretary's arm and, in an anxious voice, whispered: "Chapman, some one has been here again." "Surely not, sir," protested the secretary. "You have just opened the hall-door yourself; and the key never left your pocket while we were lunching in the restaurant." "Chapman, some one has been here again," Mr. Kesselbach repeated. He pointed to a traveling-bag on the mantelpiece. "Look, I can prove it. That bag was shut. It is now open." Chapman protested. "Are you quite sure...