Disraeli had an expression as if he'd seen a ghost, "Thank God, I've only one detective friend like you in my life. If there were more, someone might have guessed the color of my underwear today."
Arthur, hearing this, suddenly remembered the recently updated file in Disraeli's case.
In those days, social mores were still relatively conservative on the surface, so aside from some upper-class ladies who had a need for lace underwear, most people opted to buy fabric and make their own undergarments at home.
Not long ago, an agent from the Police Intelligence Department had accidentally seen Disraeli purchasing a small piece of dark green fabric in a cloth shop, a piece so small it couldn't have been for anything other than a pair of shorts.
Thus, Arthur replied offhandedly, "Dark green."
Once these words left Arthur's mouth, Disraeli was genuinely shocked; he stopped in his tracks and stared with wide eyes, "How on earth did you know that?"