Follow Jem and see - against the backdrop of the Shadow Market's dark dealings and festival - Anna Lightwood's doomed romance, Matthew Fairchild's great sin, and Tessa Gray as she is plunged into a world war. Valentine Morgenstern buys a soul at the Market and a young Jace Wayland's soul finds safe harbor. In the Market is hidden a lost heir and a beloved ghost, and no one can be saved one they've traded away their heart. Not even Brother Zachariah.