Summary of City of Bones

One night at a club, 15-year-old Clarissa "Clary" Fray witnesses an apparent murder by a strange teenager whom no one else can see, Jace Wayland. He tells her the victim was actually a disguised demon. The next day, after Clary sees Jace again, she returns home to find her mother Jocelyn Fray, missing and her apartment trashed and occupied by a monstrous creature. Clary defeats it but is injured.
Jace finds her and takes her to his home, "The Institute," an old Gothic cathedral that normal humans, called "mundanes" or "mundies" by the inhabitants, can't see, because it is concealed by a magic called 'glamour'. After recuperating, Clary meets Jace's tutor, Hodge Starkweather, and his adoptive siblings Isabelle Lightwood and Alec Lightwood. They are Shadowhunters, who hunt demons unseen by humans- except clary. With the help of "Silent Brother" Jeremiah, a monk with magical powers, their investigation into why Clary can see them uncovers a block on her mind, keeping her memories sealed. She travels with Jace and Jeremiah to the City of Bones, where the Silent Brothers attempt to break it. Although the attempt fails, Clary gets flashes of information, particularly the name Magnus Bane, Tracing this name to a party, Clary and the Shadowhunter teens, along with her mundane best friend Simon, discover that Magnus is the High Warlock of Brooklyn, and he placed the block on Clary at the request of her mother, an ex-Shadowhunter. Every two years, Jocelyn had been sending Clary to Magnus to have her memories and Sight (ability to see what mundanes cannot) blocked, hoping to keep her safely in the dark about her true self so she could live a normal life. Magnus refuses to bring Clary's memories back, claiming it would be too difficult and dangerous, and they may return anyway, now that she knows the truth and the spell has begun to fade. During the party, Simon ignores Isabelle's warnings and consumes a drink, which was spiked, offered to him by a faerie, who was a vampire.