I'm reading Night Watch, by Sergei Lukyanenko.
In our world, along with us, live the Others, humans with supernatural abilities. Among them you can find your typical horror movie monsters like Vampires, Werewolves, Shapeshifters, Magicians, Warlocks, etc. The Others must choose a side when they find out their real nature: the Light or the Dark.
To oversee the Others, the Watches were created. The Night Watch deals with the Dark Ones who come out at night, they are agents of the Light. In the opposite side, the Day Watch is composed by Dark Ones, to keep an eye on the Light Ones who go out during the day.
The story focuses on a mid-level Night Watch agent, who finds himself in the midst of a Day Watch plot to tip the balance between Light (Good) and Dark (Evil) and bring forth another war between both sides.
Highly recommendable, it's a saga composed by four books: Night Watch, Day Watch, Twilight Watch and Last Watch.
Also I recommend, The Hitchhiker's Guide to the Galaxy, I believe most of your english-speakers may have read it already, or at the very least heard about it, but it doesn't come over these parts so I had to order it from Amazon. Very funny and well written book