This shot certainly meets the challenge and connects well with the title you chose. (I think that was the only "challenge' in this challenge - take a picture and find a book that suited it) The monochrome look works to give this shot a bleak feeling. Nice dramatic look to the sky as well.
It appears that you were aiming for symetry but didn't quite achieve it. I can imagine it was hard to shoot as there was probably people around. It would have been nice to get some space on both sides.
I like the idea here and its a good shot. For me this would have been better taken from one corner low down with a wide angle lens to give a more sinister feel. Good shot all the same.