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110 popular Ambassador. And had not Slavonski, on the memorable occasion of the Incog. Club raid, referred to her as "our trusty associate Mademoiselle Zero?" but, on the other hand, Inspector Badger had placed himself unreservedly under her guidance when she steered the river-police motor-launch in pursuit of the desperate "Hi-Hi!" gang. It was all very puzzling to me, plain John Humdrum, M.D., and when I now look back over that period I see that Sybil's friendship kept me very busy indeed.

Possibly something of the sort flashed across my mind one morning when I found on my breakfast table a note addressed in Sybil's characteristic hand. It was postmarked "Express Aerial Service. Tokio to Aberdeen," and franked "Urgent and Frantic" in violet ink. Stamps of the highest possible value were affixed wherever there was an inch of space in the dear girl's usual lavish manner. The enclosure, like all her business messages, was brief but decided.

"A great danger threatens," it ran. "Meet me at twelve to-night in the Mummy Room, British Museum.—Sybil."

Unfortunately it was not dated.

It was, therefore, in a rather doubtful frame of mind that I presented myself, shortly before midnight, at the formidable closed gates in Great Russell Street. A printed notice, read uncertainly by an adjacent street lamp, informed me that the galleries closed at six.

As I stood there in indecision an official emerged stealthily from the shadow of an angle in the wall, where he had evidently been awaiting me.

"That's all right, sir," was his welcome assurance, after he had flashed the light of an electric torch several times all over me. “The young lady has arranged everything."

Without further explanation he led the way across