I. THE NINESCORE MYSTERY Well, you know, some say she is the daughter of a duke, others that she was born in the gutter, and that the handle has been soldered on to her name in order to give her style and influence.

I could say a lot, of course, but “my lips are sealed,” as the poets say. All through her successful career at the Yard she honoured me with her friendship and confidence, but when she took me in partnership, as it were, she made me promise that I would never breathe a word of her private life, and this I swore on my Bible oath--“wish I may die,” and all the rest of it.

Yes, we always called her “my lady,” from the moment that she was put at the head of our section; and the chief called her “Lady Molly” in our presence. We of the Female Department are dreadfully snubbed by the men, though don’t tell me that women have not ten times as much intuition as the blundering and sterner sex; my firm belief is that we shouldn’t have half so many undetected crimes if some of the so-called mysteries were put to the test of feminine investigation.

Do you suppose for a moment, for instance, that the truth about that extraordinary case at Ninescore would ever have come to light if the men alone had had the handling of it? Would any man have taken so bold a risk as Lady Molly did when---- But I am anticipating.

Let me go back to that memorable morning when she came into my room in a wild state of agitation.

“The chief says I may go down to Ninescore if I like, Mary,” she said in a voice all a-quiver with excitement.