Holmes reveals someone in a secret room.

Holmes reveals Mr. Douglas, who seems to appear from out of the wall.

Mrs. Douglas gave a cry of astonishment at Holmes’s words. The detectives and I must have echoed it, when we were aware of a man who seemed to have emerged from the wall, who advanced now from the gloom of the corner in which he had appeared. Mrs. Douglas turned, and in an instant her arms were round him. Barker had seized his outstretched hand.

“It’s best this way, Jack,” his wife repeated; “I am sure that it is best.”