The Oxford Book of American Det by Utente

back into the prison from which he had undertaken to escape.
    “Here is Cell 13,” said the warden, stopping three doors down the steel corridor. “This is where we keep condemned murderers. No one can leave it without my permission; and no one in it can communicate with the outside. I’ll stake my reputation on that.
    It’s only three doors back of my office and I can readily hear any unusual noise.”
    “Will this cell do, gentlemen?” asked The Thinking Machine. There was a touch of irony in his voice.
    “Admirably,” was the reply.
    The heavy steel door was thrown open, there was a great scurrying and scampering of tiny feet, and The Thinking Machine passed into the gloom of the cell. Then the door was closed and double locked by the warden.

    “What is that noise in there?” asked Dr. Ransome, through the bars.
    “Rats—dozens of them,” replied The Thinking Machine, tersely.
    The three men, with final good nights, were turning away when The Thinking Machine called:
    “What time is it exactly, warden?” “Eleven seventeen,” replied the warden.
    “Thanks. I will join you gentlemen in your office at half-past eight o’clock one week from tonight,” said The Thinking Machine. “And if you do not?” “There is no ‘if’
    about it.”
    II
    Chisholm Prison was a great, spreading structure of granite, four stories in all, which stood in the centre of acres of open space. It was surrounded by a wall of solid masonry eighteen feet high, and so smoothly finished inside and out as to offer no foothold to a climber, no matter how expert. Atop of this fence, as a further precaution, was a five-foot fence of steel rods, each terminating in a keen point. This fence in itself marked an absolute deadline between freedom and imprisonment, for, even if a man escaped from his cell, it would seem impossible for him to pass the wall.
    The yard, which on all sides of the prison building was twenty-five feet wide, that being the distance from the building to the wall, was by day an exercise ground for those prisoners to whom was granted the boon of occasional semi-liberty. But that was not for those in Cell 13.
    At all times of the day there were armed guards in the yard, four of them, one patrolling each side of the prison building.
    By night the yard was almost as brilliantly lighted as by day. On each of the four sides was a great arc light which rose above the prison wall and gave to the guards a clear sight. The lights, too, brightly illuminated the spiked top of the wall. The wires which fed the arc light ran up the side of the prison building on insulators and from the top story led out to the poles supporting the arc lights.
    All these things were seen and comprehended by The Thinking Machine, who was only enabled to see out his closely barred cell window by standing on his bed. This was on the morning following his incarceration. He gathered, too, that the river lay over there beyond the wall somewhere, because he heard faintly the pulsation of a motor boat and high up in the air saw a river bird. From that same direction came the shouts of boys at play and the occasional crack of a batted ball. He knew then that between the prison wall and the river was an open space, a playground.
    Chisholm Prison was regarded as absolutely safe. No man had ever escaped from it.
    The Thinking Machine, from his perch on the bed, seeing what he saw, could readily understand why. The walls of the cell, though built he judged twenty years before, were perfectly solid, and the window bars of new iron had not a shadow of rust on them. The window itself, even with the bars out, would be a difficult mode of egress because it was small.

    Yet, seeing these things, The Thinking Machine was not discouraged. Instead, he thoughtfully squinted at the great arc light—there was bright sunlight now—and traced with his eyes the wire which led from it to the building. That electric wire, he reasoned, must come down the side of the building