Borrow it from the library.. I bought a copy, but tbh after going through it a couple of times it's been out on loan to various friends. It is a useful quick guide and is not complicated.
What book? is a very vague question.
I'd suggest The Photographer's Eye by Michael Freeman or Hot Shots by Kevin Meredith (or both) and completely forget about anything titled DSLR for dummies/idiots, or the Complete guide to..
The modern camera is a very capable tool and can make thousands of calculations about exposure, etc. However, it's also an idiot. It hasn't a clue whether the scene you've put it in front of is interesting or how to make it interesting. That's the bit you have no option but to learn for yourself.
Don't be another technically proficient photographer of boring photographs. There's enough of them already. Be someone that takes interesting photographs.
My photography bookshelf is in my signature - it's much more interesting to see what's on someones bookshelf than what's inside their camera bag.