“Do you consider that what we have heard just now has helped us to discover who was the woman in the big hat?” retorted the chief, somewhat testily.

“Perhaps not,” replied my dear lady, with her sweet smile; “but it may help us to discover who murdered Mr. Culledon.”

With which enigmatical statement she effectually silenced the chief, and finally walked out of his office, followed by her faithful Mary.

Following Katherine Harris’s indications, a description of the lady who was wanted in connection with the murder of Mr. Culledon was very widely circulated, and within two days of the interview with the ex-parlour-maid another very momentous one took place in the same office.

Lady Molly was at work with the chief over some reports, whilst I was taking shorthand notes at a side desk, when a card was brought in by one of the men, and the next moment, without waiting either for permission to enter or to be more formally announced, a magnificent apparition literally sailed into the dust-covered little back office, filling it with an atmosphere of Parma violets and russia leather.

I don’t think that I had ever seen a more beautiful woman in my life. Tall, with a splendid figure and perfect carriage, she vaguely reminded me of the portraits one sees of the late Empress of Austria. This lady was, moreover, dressed to perfection, and wore a large hat adorned with a quantity of plumes.

The chief had instinctively risen to greet her, whilst Lady Molly, still and placid, was eyeing her with a quizzical smile.

“You know who I am, sir,” began the visitor as soon as she had sunk gracefully into a chair; “my name is on that card. My appearance, I understand, tallies exactly with that of a woman who is supposed to have murdered Mark Culledon.”

She said this so calmly, with such perfect self-possession, that I literally gasped. The chief, too, seemed to have been metaphorically lifted off his feet. He tried to mutter a reply.

“Oh, don’t trouble yourself, sir!” she interrupted him, with a smile. “My landlady, my servant, my friends have all read the description of the woman who murdered Mr. Culledon. For the past twenty-four hours I have been watched by your police, therefore I have come to you of my own accord, before they came to arrest me in my flat. I am not too soon, am I?” she asked, with that same cool indifference which was so startling, considering the subject of her conversation.