It's finally here!! The prequel to City of Bones, City of Ashes, and City of Glass.  I have just started it, and love knowing about the Shadowhunters already.  The time is the 1800s, and Tessa is trying to find her missing brother Nate.  Along the way Tessa finds out she has special powers and is abducted by the Dark Sisters.  They are just as they are called "dark".  Can't wait to finish it!