The Shadowhunters try to track down the new imposing threat, while Jace has a suspicion that Jonathan is back and behind the mundane attacks. Simon tries to figure out what The Seelie Queen did to him during his time in the glade. Alec decides to host a Lightwood family dinner at Magnus' house after a surprising visit from Maryse.
18 year old Clary Fray, finds out on her birthday that she is not who she thinks she is, but rather comes from a long line of Shadowhunters - human-angel hybrids who hunt down demons.
When her mother Jocelyn is kidnapped, Clary is thrown into the world of demon hunting with mysterious Shadowhunter Jace and her best friend, Simon. Now living among faeries, warlocks, vampires and werewolves, Clary begins a journey of self-discovery as she learns more about her past and what her future may hold.