* During Harry's [[spoiler:invasion of the BigBad's fortress from the Nevernever side]], he unleashes the ghosts of killers on the enemy forces. Harry Dresden describes the scene as fresh scenes for his nightmares. He only describes the least disturbing sequence from the resulting [[CurbStompBattle slaughter]], and leaves the rest up to the reader's imagination. It's bad enough.
** And when you consider everything that Harry's described in previous books, it's cringe-worthy to imagine what he didn't want to tell us.
* ''He Who friggin' Walks Behind''. During a flashback, we finally learn the details of Harry's first encounter with it. Turns out it's a huge, incredibly strong and even more sadistic monstrosity that is ''always behind you, no matter where you turn'', so the only way you can see it is in a mirror or other reflective surface. 16-year-old Harry first sees it reflected in an arcade machine in a gas station; he turns around to look and sees nothing, but when he turns back, it's now standing two feet closer. And ''smiling''. Shortly afterward, it tore a person in three pieces with no effort at all. And no, you can't just stand with your back to the wall; Harry tried that, and it ''still'' came up behind him, lifted him by the neck with a tentacle, and threw him across the room. Think equal parts Shagnasty and SlenderMan, and you'll have a bit of an idea.
** Not to mention what Harry feels when looking at He Who Walks Behind. That descriptive monologue would have done Creator/HPLovecraft proud.
** Also, now we know ''exactly'' why Harry had such a BrownNote reaction in ''Blood Rites'' when he found out that He Who Walks Behind was the one behind the entropy curse.
** Harry asked for the creature's name. ''[[BrownNote He got it]]''.
* What [[spoiler: Molly]] [[PowerBornOfMadness pretended to become]] after the end of Changes, [[PowerBornOfMadness and]] [[MindRape what]] [[NightmareFuelStationAttendant she]] [[AdultFear actually becomes]] by the time of the book.
** The worst part of it wasn't seeing her in action so much as the way she described it. That it was ''easy'' to [[spoiler: set up small illusions that would end with people killing each other]]. The same way [[spoiler: it was ''easy'' to help Rosie and Nelson way back during the Literature/ProvenGuilty casefile]].
** And Will describing the results of the intervention.
-->'''Will:''' I've got a picture in my head of being dragged off into the Nevernever by monsters that I ''still'' can't get rid of. When she gave it to me, all I could do was curl up into a ball and scream.
* Harry's eventual fate if he failed to find his [[spoiler: killer]]: to watch from the shadows as the people he cared about lived and died, [[AndIMustScream and be powerless to do anything.]] [[spoiler: That he's running around in his immortal soul during this only makes it worse.]]