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 that you shut it, sir? Besides, the bag contains nothing but odds and ends of no value, articles of dress. . . .""It contains nothing else, because I took my pocket-book out before we went down, by way of precaution. . . . But for that. . . . No, Chapman, I tell you, some one has been here while we were at lunch."There was a telephone on the wall. He took down the receiver:"Hallo! . . . I'm Mr. Kesselbach. . . . Suite 415 . . . That's right. . . . Mademoiselle, would you please put me on to the Prefecture of Police . . . the detective department. . . . I know the number . . . one second . . . Ah, here it is! Number 822.48. . . . I'll hold the line."A moment later he continued:"Are you 822.48? I should like a word with M. Lenormand, the chief of the detective-service. My name's Kesselbach. . . . Hullo! . . . Yes, the chief detective knows what it's about. He has given me leave to ring him up. . . . Oh, he's not there? . . . To whom am I speaking? . . . Detective-sergeant Gourel? . . . You were there yesterday, were you not, when I called on M. Lenormand? Well, the same thing that I told M. Lenormand yesterday has occurred again to-day. . . . Some one has entered the suite which I am occupying. And, if you come at once, you may be