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and scanning the dark countryside outside the walls of the castle. She had done this for the past two nights and so far had been disappointed to see no return signal. She clung to the hope that Will would reply. But the hope was getting fainter and fainter. Perhaps he was –
    A light! There it was, off to her left, moving among the trees! For a moment, she felt her excitement surge, then, just as quickly, it deflated as she realized that the light was red and that it was moving along at a fixed height from the ground, alternately fading and flashing as trees obscured it. She knew that strange lights were often reported among the trees of Grimsdell Wood. Perhaps this was all it was.
    Then, out to her right, she saw another. This one was yellow, and it moved up and down in a straight line. Then it disappeared for a few seconds, reappearing some distance to the left of its original position, moving up and down.
    As she watched, it went out again and the red light reappeared, flitting in and out of sight among the trees. Alyss's heart sank. For a moment she had thought her attempts had been successful.
    Then she saw it! At a point halfway between the other lights, a bright white light suddenly appeared. And it traced a steady square pattern, just as her own had done – from one corner of the square to another in a steady sequence. Top left. Top right. Bottom right. Bottom left.
    Far below, she heard the muted murmur of voices on the battlements as the sentries also saw the lights, and she realized what Will was doing. He knew there was no way he could conceal the light from the guards. And once the news of a flashing white light was reported to Keren, it wouldn't take long for the renegade leader to guess that somebody was signaling. And there was only one person they might be signaling to.
    So Will had decided to hide his signal lamp among other lights, the sort of lights people expected to see on the fringes of Grimsdell Wood. She smiled to herself – Will was hiding a tree in the forest, as the old saying went. Another light, this one blue, was flashing. Then the yellow one was back. Then the red one. And then the white one in the center. She set herself to ignore red, blue and yellow and watch only white. She picked up her own lamp, concealing it behind a stiff piece of old, dried-out leather she had found discarded in the bottom of the wardrobe.
    She centered the light in the window and then flicked the leather back and forth five times, sending a series of five rapid flashes to the watchers at the edge of the forest. In the code, five rapid flashes from the center of the square meant communication had been established.
    Immediately, the other light replied in kind. Five rapid flashes, then a pause, then three longer flashes – the standard response meaning, Are you ready to receive a message?
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    The Siege of Macindaw
    She hurried to the table and seized paper and a graphite chalk. She knew Will would wait until she was ready. Back at the window, she raised the lamp in a vertical line, up and down three times. The white light outside mirrored the action. In her peripheral vision, she could see the moving colored lights flashing and winking away. She even realized that another red light had joined the display. But her attention was focused on the white light.
    It began to flash, and she noted down the letters as Will sent them.
    The Courier's code was a simple but effective system. Twenty-four of the letters of the alphabet were arranged in a grid of four numbered lines, six letters to a line. To achieve an even grid, the letters Z and W were omitted. S and V would take their place if necessary.

     
    This meant that the letter A was represented by the cipher 1-1, being the first line of the grid and the first letter in the line.
    By the same token, G would be 2-1, and P would be 3-4. The person sending the message would stipulate the line number by holding the lamp in a specific corner of the square. Top left was 1, top