very famous Turkish _shaka_ called _Kasredin_, one of those old
half-comic miracle plays with an allegorical meaning which they call
_orta oyun_, and which take a week to read. That tale tells of the
coming of a prophet, and I found that the select of the faith spoke of
the new revelation in terms of it. The curious thing is that in that
tale the prophet is aided by one of the few women who play much part in
the hagiology of Islam. That is the point of the tale, and it is
partly a jest, but mainly a religious mystery. The prophet, too, is
not called Emerald.'

'I know,' I said; 'he is called Greenmantle.'

Sandy scrambled to his feet, letting his pipe drop in the fireplace.

'Now how on earth did you find out that?' he cried.

Then I told them of Stumm and Gaudian and the whispered words I had not
been meant to hear. Blenkiron was giving me the benefit of a steady
stare, unusual from one who seemed always to have his eyes abstracted,
and Sandy had taken to ranging up and down the room.

'Germany's in the heart of the plan. That is what I always thought.
If we're to find the _Kaaba-i-hurriyeh_ it is no good fossicking among
the Committee or in the Turkish provinces. The secret's in Germany.
Dick, you should not have crossed the Danube.'

'That's what I half feared,' I said. 'But on the other hand it is
obvious that the thing must come east, and sooner rather than later. I
take it they can't afford to delay too long before they deliver the
goods. If we can stick it out here we must hit the trail ... I've got
another bit of evidence. I have solved Harry Bullivant's third puzzle.'

Sandy's eyes were very bright and I had an audience on wires.

'Did you say that in the tale of _Kasredin_ a woman is the ally of the
prophet?'

'Yes,' said Sandy; 'what of that?'

'Only that the same thing is true of Greenmantle. I can give you her
name.'

I fetched a piece of paper and a pencil from Blenkiron's desk and
handed it to Sandy.

'Write down Harry Bullivant's third word.'

He promptly wrote down '_v. I._'

Then I told them of the other name Stumm and Gaudian had spoken. I
told of my discovery as I lay in the woodman's cottage.

'The "I" is not the letter of the alphabet, but the numeral. The name
is Von Einem--Hilda von Einem.'

'Good old Harry,' said Sandy softly. 'He was a dashed clever chap.
Hilda von Einem? Who and where is she? for if we find her we have
done the trick.'

Then Blenkiron sp