''Lupin,'' I said, ''tell me something about yourself.''''Why, what would you have me tell you? Everybody knows my life!'' replied Lupin, who lay drowsing on the sofa in my study.''Nobody knows it!'' I protested. ''People know from your letters in the newspapers that you were mixed up in this case, that you started that case. But the part which you played in it all, the plain facts of the story, the upshot of the mystery: these are things of which they know nothing.''