noon
It all depends . '' `` How will you know if he does ? '' asked Jack . `` I will come back here to-morrow at noon , '' replied the guide . `` If there is an answer , there will be a little white flag where the letter was , Then I will know what to do . '' There was nothing to do but wait . Mr. Hardy explained that it was necessary that they move back down the mountain , a mile or more away from the signal tree .