If you want a simple introduction to entropy, relativity and quantum mechanics, their unexplained facets, and how they feed into a theory of how Time is emerges from reality, The Physics of Time by Robert A. Muller is an excellent place to start. While it took me six months to read it, that’s a reflection of my time constraints, and not of the readability of the book.
All the same, if you’re not a physicist, then you’ll need to read this in a quiet environment. Constant interruptions will seriously degrade comprehension, far more than most books.
