“Pull harder,” he advised. “It ain't half up yet. Go on and pull it and kill a man. That's what I said, kill a man, spatter his brains out on the floor, or slap a hole into him the size of your fist. That's what killing a man means.” The hammer lowered jerkily but gently. The man turned his back and walked slowly to the door. She swung the revolver around so that it bore on his back. Twice again the hammer came up halfway and was reluctantly eased down. At the door the man turned for a moment before passing on. A sneer was on his lips. He spoke to her in a low voice, almost drawling, but in it was the quintessence of all loathing, as he called her a name unspeakable and vile. THE MEXICAN NOBODY knew his history--they of the Junta least of all. He was their “little mystery,” their “big patriot,” and in his way he worked as hard for the coming Mexican Revolution as did they. They were tardy in recognizing this, for not one of the Junta liked him. The day he first drifted into their crowded, busy rooms, they all suspected him of being a spy--one of the bought tools of the Diaz secret service. Too many of the comrades were in civil an military prisons scattered over the United States, and others of them, in irons, were even then being taken across the border to be lined up against adobe walls and shot. At the first sight the boy did not impress them favorably. Boy he was, not more than eighteen and not over large for his years. He announced that he was Felipe Rivera, and that it was his wish to work for the Revolution. That was all--not a wasted word, no further explanation. He stood waiting. There was no smile on his lips, no geniality in his eyes. Big dashing Paulino Vera felt an inward shudder. Here was something forbidding, terrible, inscrutable. There was something venomous and snakelike in the boy's black eyes. They burned like cold fire, as with a vast, concentrated bitterness. He flashed them from the faces of the conspirators to the typewriter which little Mrs. Sethby was industriously operating. His eyes rested on hers but an instant--she had chanced to look up--and she, too, sensed the nameless something that made her pause. She was compelled to read back in order to regain the swing of the letter she was writing. Paulino Vera looked questioningly at Arrellano and Ramos, and questioningly they looked back and to each other. The indecision of doubt brooded in their eyes. This slender boy was the Unknown, vested with all the menace of the Unknown. He was unrecognizable, something quite beyond the ken of honest, ordinary revolutionists whose fiercest hatred for Diaz and his tyranny after all was only that of honest and ordinary patriots. Here was something else, they knew not what. But Vera, always the most impulsive, the quickest to act, stepped into the breach.