Time's Arrow

Tied for the most difficult book I have ever read. It was also the first book where you actually did have to read the summary (on the back cover) to understand the context. Either way, the reverse Time Arrow used in the book was useless. It added an extreme amount of effort to understand basic elements of the story (in UX we call this cognitive load). Lastly, I DON'T read books on this topic.
Steer clear of this one, folks.