I knocked out my pipe on a bar of the grate.

"We are in the thick of it here," I said.

"We are always in the thick of it," replied Smith. "Our danger is no greater in Norfolk than in London. But what do they want to do? That man in the train with the case of instruments—WHAT instruments? Then the apparition of the green eyes to-night. Can they have been the eyes of Fu-Manchu? Is some peculiarly unique outrage contemplated—something calling for the presence of the master?"

"He may have to prevent Eltham's leaving England without killing him."

"Quite so. He probably has instructions to be merciful. But God help the victim of Chinese mercy!"

I went to my own room then. But I did not even undress, refilling my pipe and seating myself at the open window. Having looked upon the awful Chinese doctor, the memory of his face, with its filmed green eyes, could never leave me. The idea that he might be near at that moment was a poor narcotic.

The howling and baying of the mastiff was almost continuous.

When all else in Redmoat was still the dog's mournful note yet rose on the night with something menacing in it. I sat looking out across the sloping turf to where the shrubbery showed as a black island in a green sea. The moon swam in a cloudless sky, and the air was warm and fragrant with country scents.

It was in the shrubbery that Denby's collie had met his mysterious death—that the thing seen by Miss Eltham had disappeared. What uncanny secret did it hold?

Caesar became silent.