Her opponent was a man, and as he too flung off his mask I saw that he was a gentleman of years. If Miss Cecilia Hollister chose to meet strange men on the roof of her aunt's house and practice the fencer's art with them, it was no affair of mine, and I was about to withdraw when the stranger swung round and saw me. His sudden exclamation caused the girl to turn, and as a reasonable frankness has always seemed to me essential to a nice discretion, I crawled out on the roof. "I beg your pardon, Miss Hollister, but if I had known you were here I should not have intruded. The vagaries of the library chimney have been on my mind, and I was about to have another peep into yonder pot." She stood at her ease, with one hand resting lightly against the inexplicable chimney in question, and still somewhat spent from her exercise. [Illustration: She stood at her ease, with one hand resting lightly against the inexplicable chimney.] "Father," she said, turning to the stranger who stood near, "this is Mr. Ames, who is Aunt Octavia's guest." The light of the gibbous moon enabled me to discern pretty clearly the form and features of Mr. Bassford Hollister. And I find, in looking over my notes, that I accepted as a matter of course the singular meeting with my hostess's brother. I had grown so used to the ways of the Hollisters I already knew, that the meeting with another member of the family at eleven o'clock at night on the roof of this remarkable house gave me no great shock of surprise. He was tall, slender and dark, with fine eyes that suggested Cecilia's. His close-trimmed beard was slightly gray: but he bore himself erect, and I had already seen that he was alert of arm and eye and nimble of foot. He put on his coat, which had been lying across one of the crenelations, and covered his head with a small soft hat. "This will do for to-night, Cecilia. You had the best of me. We 'll try again another time. I 'm glad you stopped us, Mr. Ames. We 'd had enough." He seemed in no wise disturbed by my appearance, nor in any haste to leave. This meeting between the father and daughter, I reasoned, could hardly have been a matter of chance, and it must have been in Cecilia's mind that some sort of explanation would not be amiss. "Father and I have fenced together for years," she said. "My sister Hezekiah does not care for the sport. As you have already seen that my aunt Octavia is an unusual woman, given to many whims, I will not deny to you that at present my father is _persona non grata_ in this house. I beg to assure you that nothing to his discredit or mine has contributed to that situation, nor can our meeting here to-night be construed as detrimental to him or to me. In meeting my father in this way I have in a sense broken faith with my aunt Octavia, but I assure you, Mr. Ames, that it is only the natural affection for a daughter that led my father to seek me here in this clandestine fashion."