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City of Glass (2015) Parents Guide: Is the book OK for kids?

Age Rating, Sex, Violence & Language

Discover more secrets about the Shadowhunters as they fight to protect the world from demons in the third book in the internationally bestselling series. Amid the chaos of war, the Shadowhunters must decide to fight with the vampires, werewolves and other Downworlders or against them. Meanwhile, Jace and Clary have their own decision to make: should they pursue the love they know is a mortal sin?

YA • 2015 • 560 pages • Lexile 790L (roughly grades 4–5 reading difficulty)

4.2
Average rating by Bontent members
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Age
14+

City of Glass is the concluding book in the original Mortal Instruments trilogy and earns its Young Adult rating through increased violence, war themes, and high-tension character dynamics. Significant plot points include the death of a child character, intense magical battles, and the resolution of the series' central pseudo-incestuous conflict when true lineages are revealed. The book also features moderate profanity, teen romance… Sign up for the full guide

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Is City of Glass appropriate for kids?

City of Glass is the concluding book in the original Mortal Instruments trilogy and earns its Young Adult rating through increased violence, war themes, and high-tension character dynamics. Significant plot points include the death of a child character, intense magical battles… Read more — free account

Content severity in City of Glass

Sex Strong 5/10
Violence Intense 8/10
Language Moderate 3/10
Substances Moderate 3/10
Themes Strong 5/10

What happens in City of Glass, moment by moment

  1. p. 42 ⚔ Violence & Gore 4/10
  2. p. 78 💬 Language 3/10
  3. p. 95 🔥 Mature Themes 2/10
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Sex and nudity in City of Glass

While the story centers on the intense romantic tension between Jace and Clary, physical intimacy is limited to passionate kissing and a scene where a couple sleeps in the same bed fully clothed. References are made to the 'mortal sin' of their supposed relationship, though it is eventually revealed they are not related. Brief mentions of attraction and flirting occur between other characters, including Alec’s growing openness about his feelings for Magnus. The prose describes the heat and longing of these…

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Violence and gore in City of Glass

Violence is more graphic than previous entries, featuring a full-scale demonic invasion of a city with significant casualties. Significant events include the murder of a young child, Max Lightwood, by a primary antagonist, the execution of a prisoner, and a final battle involving stabbings and supernatural death. The death of the antagonist Valentine is described with some detail as he is punished by the Angel Raziel. There are descriptions of open wounds, blood-stained clothes, and the physical toll of magical…

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Language in City of Glass

Moderate usage of profanity throughout, consistent with the previous books in the series. Terms like 'hell,' 'damn,' 'bastard,' 'ass,' and 'bitch' are used occasionally in dialogue and internal monologue. The language is generally used to emphasize frustration or high-stakes emotion during combat or intense arguments between the adolescent protagonists. There are no severe racial slurs or highly graphic expletives used. The dialogue reflects a gritty, urban fantasy tone suitable for a young adult audience.

Drugs, alcohol, and smoking in City of Glass

Substance use is primarily metaphorical through the 'Downworlder' lore, such as vampires needing to consume blood to survive and heal. Simon is given bottled blood while in prison to prevent starvation, and the biological craving for it is described as a painful necessity. There are brief mentions of adults drinking wine or other spirits at social gatherings in Alicante, though no characters are depicted as intoxicated. The use of 'ichor' and magical potions serves as the primary fantasy equivalent to chemical…

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Mature themes in City of Glass

Heavy themes of identity, betrayal, and the morality of war dominate the narrative. The plot involves themes of genocide as Valentine attempts to wipe out all Downworlders to 'purify' the world. There are also deep explorations of familial grief following the loss of a sibling, specifically the impact of Max's death on the Lightwood family. Psychological abuse is a recurring theme, as Jace and Sebastian reflect on their disparate upbringings under Valentine's cold and manipulative care. Ultimately, the story…

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Frequently Asked Questions

Is City of Glass appropriate for kids?

Bontent's parent guide suggests City of Glass is best for ages 14+. City of Glass is the concluding book in the original Mortal Instruments trilogy and earns its Young Adult rating through increased violence, war themes, and high-tension character dynamics. Significant plot points…

What age rating does City of Glass have?

Books don't carry official age ratings. City of Glass is published for a YA audience, and Bontent's independent parent guide recommends it for ages 14+.

What reading level is City of Glass?

City of Glass is 560 pages and its reading level is Lexile 790L (roughly grades 4–5 reading difficulty). Bontent recommends it for ages 14+.

What is City of Glass about?

City of Glass is the concluding book in the original Mortal Instruments trilogy and earns its Young Adult rating through increased violence, war themes, and high-tension character dynamics. Significant plot points include the death of a child character, intense magical battles, and the resolution of the series'…

Is there sex or nudity in City of Glass?

While the story centers on the intense romantic tension between Jace and Clary, physical intimacy is limited to passionate kissing and a scene where a couple sleeps in the same bed fully clothed. References are made to the 'mortal sin' of their supposed…

How violent is City of Glass?

Violence is more graphic than previous entries, featuring a full-scale demonic invasion of a city with significant casualties. Significant events include the murder of a young child, Max Lightwood, by a primary antagonist, the execution of a prisoner, and a…

Is the language in City of Glass appropriate for kids?

Moderate usage of profanity throughout, consistent with the previous books in the series. Terms like 'hell,' 'damn,' 'bastard,' 'ass,' and 'bitch' are used occasionally in dialogue and internal monologue. The language is generally used to emphasize…

Are drugs, alcohol, or smoking depicted in City of Glass?

Substance use is primarily metaphorical through the 'Downworlder' lore, such as vampires needing to consume blood to survive and heal. Simon is given bottled blood while in prison to prevent starvation, and the biological craving for it is described as a…

What mature themes appear in City of Glass?

Heavy themes of identity, betrayal, and the morality of war dominate the narrative. The plot involves themes of genocide as Valentine attempts to wipe out all Downworlders to 'purify' the world. There are also deep explorations of familial grief following the…

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