The Shadow Market is a meeting point for faeries, werewolves, warlocks, and vampires. There, the Downworlders buy and sell magical objects, make dark bargains, and whisper secrets they do not want the Shadowhunters to know. Through two centuries, however, there has been a frequent visitor to the Shadow Market from the very heart of the Shadowhunters’ world. Jem Carstairs is searching through the Shadow Market, in many different cities over long years, for a relic from his past.

Follow Jem and see—against the backdrop of the Shadow Market’s dark dealings and spectacle—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 save you once you have traded away your heart. Not even Jem.