Not honouring him with much attention, Mr. Tulkinghorn takes a small key from his pocket, unlocks a drawer in which there is another key, which unlocks a chest in which there is another, and so comes to the cellar-key, with which he prepares to descend to the regions of old wine. 
Then he takes up his cellar-key, with which he prepares to descend to the regions of old wine. 