The flying demon drops Clary onto Valentine's boat.
Conveniently, she's been dropped into the room with Maia. Inconveniently, Maia tells Clary that Simon is dead.
Up above, Jace and Luke fight off more demons and board the ship.
Below decks, Clary, who has just been snatched by a demon, dropped from a great height into the main villain's stronghold, and been told that her best friend is dead is distraught…
Distraught because Jace's jacket is "ruined!" (3.18.37) "Jace will be upset that I wrecked his jacket," (3.18.37) she thinks. Priorities!
Maia reminds Clary that Simon is dead. Not just dead until dark as a vampire, but dead to the world. Dead as a doornail, even.
Clary says, "We have to get out of here" (3.18.39).
Maia, the only person who seems to still have a brain, says, "That's pretty obvious" (3.18.40).
They scooch through the hole in the wall… right into Valentine's clutches!
Up on the deck, Luke and Jace fight demons for about six pages until reinforcements arrive: the Shadowhunters! Including the Lightwoods and even the Inquisitor.
Down below, Valentine and Clary bicker a bit while all the Shadowhunters continue fighting demons.
The Inquisitor ends up sacrificing herself to save Jace—le gasp!—and whispers something to him in her last breath… but we don't get to hear what it is.
More and more fighting occurs, until Jace takes a wrong step and falls through a hole in the ship.