The Mundie Source; The Official Cassandra Clare FanSite released the book's Chapter Titles!!
Here we go;
Will visits the Cross Bones Graveyard in London.
Prologue: The Outcast Dead
Pretty literal — the Council meets to discuss whether Charlotte is fit to run the Institute; we see a bit more of the Lightwoods, not to mention the Waylands and some other familiar families.
Chapter One: The Council Chamber
“Mr. Bane has been awaiting your arrival, sir,” said the footman, and stepped aside to let Will enter.
Chapter Two: Reparations
The term, under the Accords, for a Shadowhunter killing a Downworlder without provocation.
Chapter Three: Unjustifiable Death
“This was the first time she had been alone with Will in weeks.”
Tessa, Will and Jem leave the Institute and in fact, London entirely.
Chapter Four: A Journey
“Gabriel Lightwood strode across the room to meet them. He really was quite tall, Tessa thought, craning her neck to look up at him. As a tall girl herself, she didn’t often find herself bending her head back to look up at men.”
This one is a pun that will probably only make sense upon actual reading. Althpugh one of the themes of the book is how the past affects the present.
Chapter Five: Shades of the Past
Again the theme is hidden secrets. The title comes from a Charlotte Bronte poem. “In secret kept, in silence sealed.” Tessa begins to uncover the secrets of her own origins.
Chapter Six: In Silence Sealed
I had to redact the title of this chapter. It’s a spoiler.“When Will truly wants something,” said Jem, quietly, “when he feels something — he can break your heart.”
The title here comes from Thomas de Quncey’s (yes de Quincey!) Confessions of an English Opium-Eater. The paragraph is about addiction, and both the pleasures and the pains of opium, and the chapter is not dissimilar. Also, we meet Ragnor Fell.
Chapter Eight: The Purposes of Wrath
This chapter ends the night begun in the previous chapter. And has some pretty hot kissing. Titled after a Swinburne poem.
Chapter Nine: Fierce Midnight
The virtue of angels is that they cannot deteriorate; their flaw is that they cannot improve. Man’s flaw is that he can deteriorate; and his virtue is that he can improve. —The Talmud
Chapter Ten: The Virtue of Angels
Someone rather unexpected hits Gabriel — who, really, was asking for it.
This chapter title comes from the poem “City of Dreadful Night” by James Thompson. It’s really about taking on the suffering of someone you love. Will wanders about London at night. “He had reached Fleet Street. Temple Bar was visible through the mist in the distance” — Temple Bar is the structure Jem is standing in front of, on the cover of the book.
Chapter Eleven: Wild Unrest
This is somewhat self-explanatory. There is a masquerade ball. And a balcony. And Magnus.
Chapter Twelve: The Ball
We finally see the Mortal Sword put to its actual use: extracting the truth from reluctant Shadowhunters. And it is not pretty.
Chapter Thirteen: The Mortal Sword
“Ah,” said a voice from the doorway, “having your annual ‘everyone thinks Will is a lunatic’ meeting, are you?”
Chapter Fourteen: The Silent City
From a poem by Charlotte Mew: There are thousands more; you do not miss a rose.
Chapter Fifteen: Thousands More
“Will has always been the brighter burning star, the one to catch attention — but Jem is a steady flame, unwavering and honest. He could make you happy.”
In which there are automatons and vengeance and explosions. The title comes from Shakespeare: “And brass eternal slave to mortal rage.”
Chapter Sixteen: Mortal Rage
There is the famous “in dreams begin responsibilities” but this title is actually from a poem by Matthew Arnold. The chapter from which this deleted scene was taken.
Chapter Seventeen: In Dreams
This chapter title has really freaked people out. So I will be nice and say that it is from a poem by Christopher Brennan (no relation to Sarah Rees):
Chapter Eighteen: Until I Die
Then seek not, sweet, the “If” and “Why”
I love you now until I die.
Betrayals and misunderstandings come thick and fast. And Magnus may have a new boyfriend. The title is from a poem attributed to Sir John Harrington:
Chapter Nineteen: If Treason Doth Prosper
“Treason doth never prosper: what’s the reason?
Why if it prosper, none dare call it treason.”
This is the chapter that made me cry! I rarely cry so I felt good about that. The chapter title comes from A Tale of Two Cities.
Chapter Twenty: The Last Dream
I guess if you’re paying a lot of attention you’ll recognize this as part of something Jace quotes in City of Fallen Angels. Endings, beginnings, new characters, and, I promise, not too bad of a cliffhanger.
Chapter Twenty-One: Coals of Fire