It’s silly, insane, jumps around, and makes little sense especially if you read the first book. If you didn’t read Gideon the Ninth, I suggest you do, if you did – brush up on it before starting this one. The narration in this book is so unreliable that it doesn’t only alters what Harrow remembers, but attempts to alter what the reader remembers as well.
The Binding by Bridget Collins is a novel taking place sometime in the past, where people can bind their memories in a book, freeing them of remembering.