The structure of the story builds suspense by making the narrative into a quest.
Explanation:
The narrative uses well tested techniques of building suspense in On a mountain trail by Harry Perry.
The first example one can see is in the beginning when the author describes the particular difficulty of the quest for the top.
Thus starting medias res and then going back to give details.
The second example is that the narrator often employs descriptive passages just before a new development to draw out the moment.
This builds suspense even more in the text.
