It's not language-agnostic, but it's still a great book: The D Programming Language. The reason I recommend it is because Alexandrescu is a great writer who knows a lot about programming languages and the kinds of tradeoffs that a low-level, practical, and safe programming language like D must do.

Even if you never intend to program in D, I encourage you to read this book to get a different view on metaprogramming, memory safety, and concurrency.