The Man Who Was Two by Fred M. White

Yet Gilette's face was unclouded and sunny enough; it was as if he were there for the sake of enjoyment alone. So far as his outward appearance was concerned he might have been absolutely outside the electrical atmosphere that was entirely of his own creation. He stood there, with a radiant smile on his lips, glancing round the room, as if he had been the founder of the feast, and this was one of the happiest nights of his existence.

And yet from behind those laughing eyes he was watching Marne keenly enough, and carefully noting every motion that was passing almost transparently across the South American's face. It was plain enough to see that Marne was intensely alarmed, and, at the same time, palpably puzzled. He gave the impression of an animal that knows it is caught in a trap, and yet cannot discern the barriers closing around it. And all this Gilette watched with the eye of the connoisseur in human feelings.