midnight exactly
`` For your first line to lower down to me , unravel your hose or under-jerkin , or any garment you can spare without it being noticed . This will give you a long , thin line , to the end of which you must secure a light weight to prevent it from blowing about . Now , until to-night , farewell ! I shall be there at midnight exactly , and you must be quite ready . Make no mistake , for this is your only chance , and any mistake will mean the loss of my life as well as your own . '' This ended the letter , and Roger immediately took it from Harry 's hand , and concealed it , with the first missive , in the lining of his jerkin . `` Now , Harry , '' said he , `` we must act at once ; for , as the fellow says , there is no time to lose , and it will take us all the time we have left before darkness sets in to unravel a garment to form our line .