I am actually reading The City of Bones for the second time and have recommended it to many of my friends! It's a part of a series called, "The Mortal Instruments" which is still on-going (the 5th book came out late last month!). There is also a pre-series (the 3rd book comes out in September!) and another series is also springing from this author based in the same world. I recommend this to everyone, basically because it drops you into this world, but you are seeing it with different eyes. Cassandra Clare has created a whole new world within our own and has developed it so well, that it is believable, though the series is clearly fantasy. I love these books and just about all of them!
Here's a short excerpt:
"A low laugh sounded behind him, and now there were hands on him, hauling him upright, throwing him against one of the concrete pillars. He could feel the damp stone under his back. His hands were pulled behind him, his wrists bound with wire. As he struggled, someone walked around the side of the pillar into his view: a boy, as young as Isabelle and just as pretty. His tawny eyes glittered like chips of amber. "So," the boy said. "Are there any more with you?"
The blue-haired boy could feel blood welling up under the too-tight metal, making his wrists slippery. "Any other what?"
"Come on now." The tawny-eyed boy held up his hands, and his dark sleeves slipped down, showing the runes inked all over his wrists, the back of his hands, his palms. "You know what I am."
Far back inside his skull, the shackled boy's second set of teeth began to grind.
"Shadowhunter," he hissed.
The other boy grinned all over his face. "Got you," he said."