Everything was normal for Clary Fray until she witnessed a group of teenagers murder someone. Now she's seeing things no one else can see. And her mother has vanished, leaving only a cryptic message. Clary joins the Shadowhunters, who are humans infused with angels' blood who use their supernatural abilities to wage a secret war against demons and monsters. They don't seem keen on her joining, but now that she knows what's out there, what else can she do?