City of Ashes is the second book in the Mortal Instrument Series. It continues with Clary and the others trying to stop her father, Valentine, from destroying the clave and killing all the downworlders. But they have to first get through the Inquisitor who believes that Jace is a spy for Valentine who also is coincidentally his father as well. They also have to find out why one of each of the four downworlder groups' children are being murdered and their blood being drained out.
City of Ashes is as or more captivating then the first book, City of Bones. The twists make you double guess what you think you already know as fact. The genres in the previous book are in this book as well; in the romance section there is the all famous love triangle still present. Also there is more action in this book than in the last. Over all this book is a great read and one you will not want to put down.