As they ascend the dim stairs (Mr. Tulkinghorn's chambers being on the first floor), Mr. Bucket mentions that he has the key of the outer door in his pocket and that there is no need to ring. For a man so expert in most things of that kind, Bucket takes time to open the door and makes some noise too. It may be that he sounds a note of preparation.

As they ascend the dim stairs to Mr. Tulkinghorn's chambers, Mr. Bucket mentions that he has the key and that there is no need to ring. He takes time to open the door and makes some noise too. It may be that he sounds a note of preparation.
