midnight
The three friends hurried to Jack 's room , where they were busy for some time , behind carefully drawn shades . At the end of about two hours , Jack , who had been keeping watch from a window , exclaimed : `` There they go with the stuff . It 's time we got a move on . '' `` They 'll not set it off until midnight , '' spoke Sam , `` That 's what they said . We 'll have time enough to do what we are going to . '' The three friends worked hurriedly . When they had finished they had several packages .