This is the second book in the Mortal Instruments series by Cassandra Clare. I haven't gotten very far into the book but it is continuing the characters and plot from book one: City of Bones. My days have been busy so finding some time to read is difficult right now and for me...I like to really delve into a book and just come up for air every so often. That's not an option right now!
This series of books is all about a whole separate world that exists right here along side our own but because of glamor and other tricks we can't really SEE the people in this other realm or if we do they look "normal". The world is inhabited by Shadow Hunters, demons, werewolves, faeries, and vampires. Some of the things like the Silent Brothers remind me a bit of the dementors in the Harry Potter series with their ability to read minds.