The Mortal Instruments Series (Books 1–3) by Cassandra Clare follows Clary Fray, a teenager whose ordinary life is turned upside down when she discovers that the world is secretly inhabited by Shadowhunters—warriors who protect humans from demons. After her mother disappears, Clary is drawn into the Shadowhunter world alongside Jace, Alec and Isabelle, where she learns that her own family has deep connections to this hidden world. As they investigate her mother’s disappearance, they become caught up in a dangerous conflict involving demons, powerful Shadowhunters and a mysterious enemy threatening their world.