Final answer:
The final scenes of the story suggest that the knocking at the White's were coming from their 'son' through the use of indirect clues, such as sounds of a turned knob, a footstep, and a whisper. The figure seen by John in the darkness is described as vague and distorted, hinting at the possibility of supernatural forces at play.
Step-by-step explanation:
The final scenes of the story suggest that the knocking at the White's was coming from their 'son' through the use of indirect clues. In the story, the knocking is described as coming from outside the room and being accompanied by other sounds like a turned knob, a footstep, and a whisper. Additionally, the figure seen by John in the darkness is described as vague and distorted, creating an air of mystery and suggesting that it may not be a real person. These details hint at the possibility that the knocking is the result of supernatural or otherworldly forces, possibly related to the White's 'son'.