Nevernight by Jay Kristoff
This is an adult book written by an author who also writes YA. The quotes may reflect this difference . So it's apparently Kristoff whose love of footnotes we also see in Illuninae Files. He has a ton of amazing footnotes in this series, too. some of my favorites- p19 "The Brightest Light" book burning story p119- the language of cats p125 books p186 sunglasses being blasphemous p188 sex joke tavern name p230 dueling story p246 freedom of speech p324 re: Pip and his blade All the snark "I called you nothing, sir. And I'll thank you not to call me 'girl' again, as if the word were kin to something you found on the bottom of your boot." p44 those eyes were as blind as a boy in love p126 "It may not be right," Aalea said. "It may not be just. But this is a word of senators and consuls and Luminatii-- of republics and cults and institutions built and maintained almost entirely by men. And in it, love is a weapon. Sex is...