midnight
`` There are enough people still . Whoever is afraid may leave . We must start , though , because we have rather far to go . We are not going up the well-known path , because Mr. Trius watches for apple-hunters there till midnight , I think . That suits us exactly , for he must not hear us . We are going up to the woods at the back of the castle . First , we 'll sing our challenge , then comes the pause , to give the ghost enough time , then again and after that for the third and last time .