midnight
`` I noticed , as I went last out of the room , that Slagg rose quickly and pulled a sheet off one of the beds . Afterwards , looking back , I saw him slip out and run down the passage in the opposite direction . I suspected he was about some mischief , but said nothing . `` It was getting dark , as I have said , though not dark enough for lighting the lamps , and in some corners below it was as dark as midnight . To one of these places Jeff led us . '' ` Mind how you go now , ' whispered Jeff ; ` it 's here somewhere , and there 's a hole too -- look-out -- there it is ! ' '' ` What !