The Man Who Was Two by Fred M. White

Mallison threw back his head suddenly and burst into a fit of more or less hysterical laughter. The strain on his nervous system was beginning to tell, and just for the moment he seemed to see Gilette through a mist. How many years was it, he wondered vaguely, since he had made that daring leap for freedom over the edge of Hangman's Rock? The dreary monotony of the prison life had passed into a bygone episode. But his surroundings were real enough down to the details of the dainty little caravan and the glory of the morning sun shining into the silk-covered window.

So was Gilette with that jaunty smile of his and the careless triumph on his face that nothing could disguise.