Glimpsing Infinity by K. L. Strader (link takes you to its amazon page)

It’s chock-full of all sorts of great things: sex, violence, drugs, magic, foul language, comedy, lesbians, devils and demons, angels and humans…  There’s bound to be something in it for you.

You could read the description on Amazon, but here is a synopsis if you don’t feel like going there right now (“spoiler” is a subjective term, so read on at your own risk. What I say below is evident very early in the book, so I’m not really ruining anything for you.):

The story centers on Brixton Weber, an ordinary guy who is thrown into extraordinary circumstances when he learns of a magical staff, and that it’s actually real – and that he is to wield it.  But he is not alone.  There is Benjamin, a “man” who tells him about/leads him to find the staff.  There is Amanda, a friend from high school caught up in all this by chance, just as Brixton is.  And finally there is Invidia, a bretchling (half-devil, half-demon) succubus who just so happens to be Amanda’s new girlfriend, but really she’s just there for the staff as well (hence Amanda being caught up in it by chance.)  Amanda has no idea she is anything other than human, though.  Nor does anyone know (save for Invidia) what exactly Benjamin is.  Suffice to say they are both bad-asses.

Brixton and crew get the staff and that’s the end, right?  Wrong.  Certain parties in the Infinite Hells have been patiently awaiting this moment for thousands of years, and so an army is amassed to retrieve the staff once its true location in the human realm (or Earth, as we know it) is learned.  And, of course, chaos ensues.  There is a violent, gory conclusion when our modern military collides with that of the Hells – after which Earth will never be the same.

Most of this takes place near or in the fictional town of Charton, which is a suburb of beautiful and non-fictional Cleveland, Ohio.  I spawned Charton from its real-life sister village of Grafton (Chart…graph…eh? eh?)  But the only real similarity they share is their small size.