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City of Glass  
City of glass.jpg
American cover of the book City of Glass.
Author Cassandra Clare
Country United States
Language English
Series The Mortal Instruments Trilogy
Genre(s) Young adult
Publisher United StatesMargaret K. McElderry
Publication date United StatesMarch 24, 2009
Australia March 24, 2009
Media type Print (Hardback)
Pages 560 pp (hardback, first edition} [1]
ISBN ISBN 1416914307
Preceded by City of Ashes

City of Glass is the third book in The Mortal Instruments trilogy, a young adult urban fantasy series set in New York written by Cassandra Clare. It was originally published in the USA in hardcover on March 24, 2009. A fourth book is expected in early 2011, named the City Of Fallen Angels, mainly focused on Simon and his new vampire life.



The third book in the Mortal Instruments series starts a week after City of Ashes. The Lightwoods, Jace, and Clary are leaving for the city of Alicante that evening. However, Simon goes to the Institute, where he and the Shadowhunters (except Clary) are attacked by dozens of Forsaken. Magnus Bane opens the Portal they were using to get to Alicante that night, and the group jumps through to escape their attackers. Clary finds out and is infuriated because they left her, and in her anger creates a Portal to the city. Luke, knowing she could hurt herself, jumps in with her. They land in Lake Lyn, where the angel Raziel came out of to make the first Shadowhunters. Clary swallows some of the water and, because of the lake’s cursed magical properties, she begins to fever and hallucinate while she and Luke walk to Alicante. Luke gets Clary help from his sister, Amatis Herondale, (Stephen Herondale's first wife). Amatis agrees to let Clary stay with her.

Meanwhile, Jace, Simon, and the Lightwoods are introduced to Aline Penhallow, and her handsome cousin Sebastian Verlac. Jace immediately dislikes Sebastian, and flirts with Aline - a fact that angers Simon. Alec is ordered to bring Simon to meet the new Inquisitor, who is curious as to why they brought a Downworlder into Alicante. Simon, while under the impression that the Clave will Portal him back to New York, is thrown in jail after being interrogated.

Clary sneaks out of Amatis’s house to visit the Lightwoods,where she catches Jace and Aline kissing and has a big argument with Jace. Leaving in anger, she runs into Sebastian, and tells him about how her mother is in a magical coma, and that she needs to find the warlock Ragnor Fell to fix it. Jace lashes out at Alec, admits that he knows Alec thinks himself to be in love with him but says that it is because he (Jace) was “safe”, and an excuse to not get into a relationship.

Clary and Sebastian go to Ragnor’s house the next day, and Clary (while Sebastian is frozen because Magnus doesn’t trust him) is shocked to learn that Ragnor was killed and Magnus was there in his place. Magnus tells Clary what she needs, and the answer is in a spell book disguised as a cookbook in the Wayland country home. Sebastian then takes Clary to the ruins of Fairchild manor where he kisses her but she pushes him away.Sebastian then tells clary about Simon being in jail.

Clary returns to find Jace waiting for her, she confronts him about Simon ending up in jail, they have a brief fight afterwards she gets Jace to take her to Wayland manor, and they discover an underground laboratory that Valentine had below the manor. They find a half-dead angel named Ithuriel who shows them memories, and Jace learns that he has demon blood, due to an experiment that Valentine performed on him while Jace was in the womb. The two then give Ithuriel a knife, realizing that there was no way to nurse the angel back to health. Ithuriel kills himself and the manor collapses, but both Jace and Clary survive. They kiss, then get into an argument, and they walk the five hours home in silence, only to find the city below them, Alicante, in flames.

Meanwhile, Alec, Isabelle, Aline, Sebastian, and Max are in Alicante, and they are attacked by demons. Sebastian, Max, and Isabelle hide in an empty home, while Alec goes to fight demons. Isabelle while in the house goes upstairs to get weapons, and returns to find Sebastian in the kitchen, Max nowhere to be found. Isabelle starts to worry, right before she gets hit in the head with a hammer, by no other than Sebastian.

Jace and Clary run to the Gard (the meeting place of the Clave) and find Alec. Clary then sneaks off and gives the spell book they found at the manor to Magnus, who promises to cure Clary’s mother. Clary thanks him, and then runs off with Jace and Alec.

The trio arrives at the jail where Simon is kept and breaks him out. They then get Samuel out, who they learn is actually Hodge, the previous keeper of the Institute. He tells them that the third of the Mortal Instruments (the mirror), the only one Valentine does not possess, is none other than Lake Lyn. Sebastian (who they do not know is evil) goes up and kills Hodge, claiming it was to keep them out of danger. Realizing his cover is blown; he admits to being a spy for Valentine and runs away. The four teens go back to the Hall, and learn that Max was killed by Sebastian.

The next day, Valentine comes as a Projection and warns the Clave that they have until midnight of the next day to surrender. If they don’t then Valentine will attack Alicante and slay every Shadowhunter left. He kills the Inquisitor instead of Luke, to Clary's surprise. After that the he leaves.

Later, Jace and Clary are at Amatis’s house, and he tells her that he loves her. They talk and end up falling asleep on the bed together. She wakes up to find that he is gone, and in his place he left the Morgenstern ring and a note, saying that he had gone to find Sebastian.

Clary goes downstairs and sees Simon and Isabelle making breakfast. She tells Isabelle what happened, and Clary’s mother, after being in a magical coma, shows up at the door. She and her mother argue, then Clary, in a fit of anger, storms out of the house to a hill, where she is eventually joined by Simon. They have a conversation and realize that the reason Simon can go out in sunlight is because he drunk Jace’s blood, who isn’t a “normal Shadowhunter”. They also see that, while sitting on the hill that the Clave was planning to surrender to Valentine. Clary flashes back to a rune that the dying Ithuriel had showed her, and realizes that it was a binding rune, meant to bring a Downworlder and a Shadowhunter together so they can share each other’s powers. She tells the Clave which, after much deliberation, accepts, and people start bonding. Alec and Magnus bond and Alec “comes out” by kissing him in front of everyone.

Jocelyn takes Clary aside and tells her that Clary was given angel’s blood while in the womb, thus giving her the power to create new runes. Clary also discovered that, while Jace wasn’t actually her brother, Sebastian is (so Sebastian has the demon blood, not Jace). Jace was the son of Stephen Herondale, therefore grandson of the previous Inquisitor(who died in the previous book), and while Jace was not born, he also received angel blood, explaining why he could jump extremely high.

Meanwhile, the vampire leader Raphael shows up in Projection form and says that if the Clave hands over Simon, then the vampires will fight in the battle. Simon, knowing that Raphael intends to kill him, lets Clary mark him with the Mark of Cain, the first ever Mark, an extremely powerful protection spell. Simon goes to Raphael, who can’t kill him upon discovering the Mark, but Simon must now fight in the battle.

Jace finds Sebastian talking with Valentine, who intends to go to Lake Lyn to summon Raziel. After Valentine leaves, the two boys fight, and Sebastian tells Jace that he is Clary’s brother, not Jace. Jace is almost killed, but Isabelle shows up and wounds Sebastian, enough so Jace can kill him.

Clary, upon learning of her father’s plans, Portals to Lake Lyn to stop Valentine from summoning Raziel to get a wish. Valentine binds and silences her with runes, then tries to kill her because the summoning requires death, but Jace arrives and stops him. Valentine then proceeds to kill Jace and summon Raziel. Raziel, however, sees through Valentine’s selfish plans, kills Valentine and instead gives Clary a wish, since Clary secretly changed his summoning runes which consisted of switching Valentine's name for Clary's. The runes now gone, she asks the angel for Jace to be alive again. He grants it and they are rescued by Shadowhunters going to the lake.

The story ends with Jocelyn telling Luke that she loves him, Simon is chased by both Maia and Isabelle because they are probably in love with him. At the very end, Clary is having a romantic night with Jace.


  • Clary Fray,16-years-old, a Shadowhunter brought up as human by her mother for her protection. She is a little over 5 feet tall and has wavy red hair. She is an artist, and is in love with Jace Wayland. They have a love affair shortly before being told that they are siblings. The veracity of this claim, however, is later thrown into question. Throughout the remainder of the series, Clary embarks on a quest to help her mother while adjusting to life as a Shadowhunter. She finds, during City of Ashes, that she can create runes by merely thinking of a word. This proves very useful for her and the Shadowhunters.
  • Jace Wayland: A Shadowhunter orphaned at a young age by the murder of his father, he lives with the Lightwoods at the Institute in New York City. He is said to be the best Shadowhunter his age, having been trained severely by his father prior to his death. He is described as having golden hair, eyes, and skin, making him popular with girls, although he has never had a serious relationship. He is very arrogant, but is a very kind and thoughtful person underneath. In City of Bones, he falls in love with Clary. He kisses her for the first time on her 16th birthday and is happy, but later tormented upon being told Clary is his sister. There are a few chapters in the series which follow Jace exclusively, revealing the frustrated, lonely personality that he compensates for by lashing out at others. His name comes from his initials, J.C., short for Jonathan Christopher. It is later discovered that he is neither Valentine's or Michael Wayland's son, but he was the son of Stephen and Céline Herondale. When a pregnant Céline committed suicide, Valentine cut the baby out of her and raised it separately, with the help of Hodge. Jace, like Clary, has more angel blood in him than the average Shadowhunter, a result of Valentine's experiments.
  • Isabelle Lightwood, Alec's sister, beautiful and obnoxious, and a Shadowhunter. She seems to have difficulty with romantic relationships, gravitating towards boys whom her parents disapprove of and quickly losing interest in them. In the series, she has short flings with Simon and a fey knight called Meliorn.
  • Alec Lightwood, a Shadowhunter and Isabelle's brother. Alec believes he is in love with Jace, but can never reveal his true feelings. He also strikes up a secret relationship with Magnus Bane, which he makes public in City of Glass
  • Simon Lewis, Clary's formerly-human, vampire best friend, who has been in love with her for several years. Upon nearly dying in City of Ashes, he is saved by Jace who allows Simon to drink his blood. After that event, he is able to be in direct sunlight without any damage. Because of this, he is called a "Daylighter".
  • Luke Garroway (Lucian Graymark), Clary's mother's best friend, once a Shadowhunter, now a werewolf.
  • Valentine Morgenstern: A powerful and evil Shadowhunter. He turns up after several years when he was supposedly dead and attempts to steal the Mortal Cup from Jocelyn. He is also said to be the real father of both Jace and Clary. Consumed by the belief that he must purify the Shadowhunter race and convinced of the righteousness of his cause, there is nothing he will not do to eradicate the earth of anything associated with vampires, werewolves and faeries. In the end, he is killed by the angel Raziel.
  • Magnus Bane, the High Warlock of Brooklyn, homosexual and in love with Alec. He is 800 years old.
  • Hodge Starkweather, Isabelle, Alec, and Jace's tutor. He is in league with Valentine. In City of Glass, he is killed by "Sebastian"
  • Raphael, the Spanish-speaking leader of the local vampire gang. He puts on a cross every Sunday, burning his skin, to visit his family--who is still unaware that he is a vampire.
  • Jocelyn Morgenstern (née Fairchild), Clary's mother and a Shadowhunter in hiding who, although plays a big part in the story's plot, is unconscious for a large portion of the time. She is married to Valentine but fled from him when she found out how evil he really was. After coming to Brooklyn, she changed her name to Fray.
  • Maia, a teen member of Luke's werewolf pack. She appears for the first time in City of Ashes. It is implied that she and Simon may have a romantic interest in one another. Her background is not very pretty: She had a cruel brother who constantly tormented her, but acted like a saint when around others. When he died, she was honestly glad. She also had an abusive boyfriend who, after she attempted to break up with him, turned her into a werewolf.
  • Sebastian Verlac, a Shadowhunter, orphaned and living in Paris. He is visiting Alicante and staying with his cousin, Aline. He seems to have feelings for Clary, but she is not interested and does not trust him. Jace, as well, does not trust Sebastian at all. It is later learned that Sebastian is actually Clary's brother, Jonathan, and a spy for Valentine, posing as Sebastian Verlac. He is killed by Jace.
  • Aline Penhallow, Sebastian's cousin, she is Isabelle's opposite, conservative on the subject of Downworlders, and seems to have a crush on Jace.
  • Amatis Herondale, Luke's sister, once married to Stephan Herondale. She lives in Alicante and serves as Clary's guardian for a majority of the book.
  • Malachi, The Consol, he pretends he is on the Clave's side but turns out to be a spy for Valentine all along.


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