midnight
But there is no time to lose , so I must endeavour to come to you to-night . I may be discovered , but I must risk that . Now , attend well to what I am going to write . At midnight to-night , instead of three nights hence , I shall be here , underneath your window . You must at any cost let down a thin cord , or all my efforts will be vain . I will then attach to the cord several small files and a saw of fine temper . If the line is not strong enough to bear the weight I will tie a light line which I shall bring with me to yours ; you will then haul that up first , and , making fast the end , you can then pull up the things I shall bring .