ten
o'clock before
The old boathouse had two windows , but each of these was nailed shut . `` I do n't believe anybody will get in there , '' observed the doctor 's son . `` Oh , I do n't think there are any thieves around , '' answered Whopper . The evening was devoted to final preparations , and it was after ten o'clock before any of the boys thought of retiring . Snap was over to Shep 's house , and the doctor 's son saw his friend to the front door . `` Now remember , seven o'clock sharp , '' said Shep . `` We want to get away as early as possible , so we 'll have plenty of time to fix up the cabin when we get there . ''