about midnight
That night , as he tossed restlessly on the pile of skins in the cave , Jack thought over a plan of getting away . It seemed practical enough , if he could only elude the vigilance of the men . But there was the hard part . He got up softly about midnight to see if he could sneak from the cave . No one was in sight . He called Nat and both crawled out into the open . `` Now we 're free ! ''