I seemed to have been walking in my sleep, pushed on by the force of the night's events. Left to myself my decision seemed utterly crazy. Why, in a minute's time I should certainly be taken for the madman I had brought myself to believe I was. How would Aurora take the story of my extraordinary adventure? "Save her from the fits of depression and that kind of spiritual disorder which are so fatal to her physical health." The words came back to me. It was the request made to me by the Grand Duke Frederick-Augustus. This was an odd way of carrying out his wishes. I wanted to bolt.

But the Grand Duchess was already there. She was in such high spirits that morning that I thought I should never have the strength of mind to break my news to her.

"Well, my friend," she said. "To what do I owe the pleasure of this visit? Have you changed your time-table? Have you decided to give me your mornings in future?"

My tell-tale face produced the same effect on her as on Melusine.

She took my arm and made me sit down on a sofa beside her.

"You nearly fell as you sat down," she said gravely. "Melusine, bring me the blue casket."

It was a diminutive box in blue enamel. What heathen stimulant could it contain? As soon as I had inhaled it at Aurora's bidding, I started as if I'd had an electric shock.

"There!" she said, "you're better already." And added:

"Begin as soon as you feel you can. We're listening."

I told her everything you already know, from my first researches into the Königsmark drama to the final climax, my visit to the secret chamber in the armoury and my sinister discovery.