When I saw that the trail goes through just one word like "Us/Them", "fictions" I thought it might be more useful if the trail went through concepts.

The links drawn between the books are “weaker than weak” (to quote Little Richard). This is akin to just thumbing the a book and saying, “oh, look, they used the word fracture and this other book used the word crumble, let’s assign a theme.” It’s a cool idea, but fails in the execution.