Arrived in Lincoln's Inn Fields and mounting Mr. Tulkinghorn's stair, he finds the outer door closed and the chambers shut, but the trooper not knowing much about outer doors, and the staircase being dark besides, he is yet fumbling and groping about, hoping to discover a bell-handle or to open the door for himself, when Mr. Tulkinghorn comes up the stairs (quietly, of course) and angrily asks, "Who is that? 
Back in Lincoln's Inn Fields and mounting Mr. Tulkinghorn's stair, he finds the outer door closed and the chambers shut. The trooper is fumbling and groping about in the dark of the stairs, hoping to discover a bell-handle, when Mr. Tulkinghorn comes up the stairs (quietly, of course) and angrily asks, "Who is that? 