"It's quite possible," he stated, as he opened the door leading out of the postmaster's private office, "that you won't hear anything more from me for some time. I hardly think it would be wise to report here too often, or that if you happen to run into me on the street that you would register recognition. I won't be using the name of Allison, anyhow, but that of Gregg--Alvin Gregg--who has made a fortune in the operation of chain stores and is looking over the field with a view to establishing connections here. Gregg, by the way, is stopping at the Majestic Hotel, if you care to reach him," and with that he was gone. Allison's first move after establishing his identity at the hotel, was to send a wire to a certain Alice Norcross in Chicago--a wire which informed her that "My sister, Mrs. Mabel Kennedy, requests your presence in Madison, Wisconsin. Urgent and immediate." The signature was "Alvin Gregg, E. A.," and to an inquisitive telegraph operator who inquired the meaning of the initials, Allison replied: "Electrical Assistant, of course," and walked away before the matter could be further discussed. The next evening Mrs. Mabel Kennedy registered at the Majestic Hotel, and went up to the room which Mr. Gregg had reserved for her--the one next to his. "It's all right, Alice," he informed her a few moments later, after a careful survey had satisfied him that the hall was clear of prying ears. "I told them all about you--that you were my sister 'n' everything. So it's quite respectable." "Mrs. Kennedy," or Alice Norcross, as she was known to the members of the Postal Service whom she had assisted on more than one occasion when the services of a woman with brains were demanded, merely smiled and continued to fix her hair before the mirror. "I'm not worrying about that," she replied. "You boys can always be trusted to arrange the details--but traveling always did play the dickens with my hair! What's the idea, anyhow? Why am I Mrs. Mabel Kennedy, and what's she supposed to do?" In a few words Allison outlined what he was up against--evidently the operation of a very skillful gang of blackmailers who were not only perfectly sure of their facts, but who didn't run any risks until their victims were too thoroughly cowed to offer any resistance. "The only weak spot in the whole plan," concluded the operative, "is that the letters invariably cease when the prospective victims lay their case before the postmaster." "You mean that you think he's implicated?" "No--but some one in his office is!" snapped Allison. "Else how would they know when to lay off? That's the only lead we have, and I don't want to work from it, but up to it. Do you know anyone who's socially prominent in Madison?" "Not a soul, but it's no trick to get letters of introduction--even for Mrs. Mabel Kennedy."