"I don't know. Watch that clump of elms."

His masterful voice had the dry tone in it betokening excitement. I
leaned on the ledge beside him and looked out. The blaze of stars
almost compensated for the absence of the moon and the night had a
quality of stillness that made for awe. This was a tropical summer,
and the common, with its dancing lights dotted irregularly about it,
had an unfamiliar look to-night. The clump of nine elms showed as a
dense and irregular mass, lacking detail.

Such moods as that which now claimed my friend are magnetic. I had no
thought of the night's beauty, for it only served to remind me that
somewhere amid London's millions was lurking an uncanny being, whose
life was a mystery, whose very existence was a scientific miracle.

"Where's your patient?" rapped Smith.

His abrupt query diverted my thoughts into a new channel. No footstep
disturbed the silence of the highroad; where was my patient?

I craned from the window. Smith grabbed my arm.

"Don't lean out," he said.

I drew back, glancing at him surprisedly.

"For Heaven's sake, why not?"

"I'll tell you presently, Petrie. Did you see him?"