Holy trigger warning Batman! If you cannot handle violence against minors I would strongly suggest you avoid this very dark tale of woe. For everyone else, however, this twisty, caustic, and sharp tale is probably a great bet. Featuring a detective with a very "Sherlockian" manner and acerbic wit, he and his bumbling assistant try to solve a very peculiar set of murders.
I would put after reading that this is the second book of this series, which does explain the missing backstory. I also loved the character of Nightingale, I wish she would have been featured more.
Thank you to NetGalley, the author Paraic O'Donnell, and Highbridge audio for my advance copy of this audiobook.