ten o'clock
`` It ought to be after our people are gone to bed . We should have to come out unknown . '' `` Yes , I forgot that . Then it would have to be ten o'clock first , and it would take us quite an hour to get quietly up to the mouth of the cave . '' `` Yes , with a lantern under a cloak , and every man a torch , '' said Ralph . `` Oh , I say , you are good at this sort of thing , '' cried Mark eagerly . `` I should n't have thought of that . ''