“What on earth did she do here?” I cried. “She simply sat in the drawing-room, sir, reading books, and sometimes had tea,” the woman answered. I did not know what to say, so I gave her a sovereign and went away. Now, what do you think it all meant? You don’t believe the woman was telling the truth?’

‘I do.’

‘Then why did Lady Alroy go there?’

‘My dear Gerald,’ I answered, ‘Lady Alroy was simply a woman with a mania for mystery. She took these rooms for the pleasure of going there with her veil down, and imagining she was a heroine. She had a passion for secrecy, but she herself was merely a Sphinx without a secret.’

‘Do you really think so?’

‘I am sure of it,’ I replied.

He took out the morocco case, opened it, and looked at the photograph. ‘I wonder?’ he said at last.