Just because it could be useful for anyone who wishes to recommend a book, can you please tell us what kind of level you are in your Japanese studies?
From your first post I assume you are just starting out, but you never know.
Well, anyway, perhaps you could look at
All about particles:
This is one of the only books I bothered to read through properly when I started learning.
It's nice and small, has lots of sentence examples of grammar usage and should give a fairly nice start to any Japanese studies.
(Just watch out for the occasional typo)
Also, like
KyleGoetz said,
Kanji in Context is an awesome book.
It can be difficult when you first start it if you aren't used to Japanese only, but after using it for a while I've certainly noticed massive jumps in my understanding of Japanese in general.
(Just remember there are no translations of sentences in this book and it assumes you already understand
at least basic Japanese)