From the cover:
The modern Theory of Information is sort of like a giant theme park with Claude Shannon, the man who invented information theory, playing the part of Walt Disney. Like Disney, Shannon is a symbol of the far flung enterprise that sprang from his vision.
Inside this Magical Kingdom, you have Shannon's original Mathematical Theory of Communication over here. You've got John von Neumann's Mathematical Theory of Games over there. Cyberneticsland is out yonder, along with Chaosland, and Fractaland, and Artificial Intelligenceland, and Set Theoryland, and Turing Mechineland, and Thermodynamicsland. There's even a gift shop on the premises. And it's just too much to see all in one day!
This book provides a kind of sky-train-ride that takes you up and over the top so you can see how it all fits together. And even when you see the whole thing, you see it has limits.