It begins with a 1st person retrospect narrative.
Each little nugget of information giving you a differing perspective of what has happened.
Then it switches to the reading of comments in the pages of a returned library book, giving more insight into what has occurred, slowly pulling the pieces together.
Finally, via a Police Detective, you begin to see the true horror of what has gone on.... the description of the unique furniture made me burb up some breakfast.
Amazing story telling!
(not to mention a great cover by the wonderful Jeffrey Kosh author & illustrator)