midnight
It was short and to the point this time . It ran thus : -- `` I am writing this in the courtyard below . I have sent up all the necessary tools ; so you need not lower the cord again to-night . It rests with you now to cut the bars , and it must be done by midnight to-morrow night or all will be in vain . I shall be here again then , and will send up a rope thick enough to bear your weight . You must climb down this , and I will be at the bottom to receive and guide you to safety . Till to-morrow , farewell ! ''