Actually. many "advanced" texts are rather short (perhaps because they are more specialized or they do not need to be verbose or "entertaining" like many elementary texts are).

That reminds me of the seen in the first Antonio Banderas Zorro movie. Anthony Hopkins' character asks the wannabe Zorro how to fence, and wannabe Zorro says you stick the pointy end in the other guy. The "basic" stuff is actually everything you have to master to avoid getting killed in your very first duel.

It reminds me of Introduction to Algorithms, a classic book by Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest. It is over 1000 pages long. But they call it "Introduction..." :)

To be honest, Cormen et Al. is an actual introductory book. While it is humongous, it covers all of the basic math, logic and algorithms you see in the first 2 or 3 years of an computer science undergraduate course. It is an introduction in the sense that knowing and mastering the tools that the book provides you will set you up for more advanced topics in the many areas of computer science. For instance, a big number of important algorithms in machine learning, computational geometry and other topics use the basic strategies of greedy, divide-and-conquer or dynamic programming algorithms.