Hello Mon Amie, The Mortal Word by Genevieve Cogman, is the 5th book in the Invisible Library series. The Mortal Word is the first book in the series that I have read. It not a requirement to read the previous 4 book to understand the storyline. If you are like me you will want to go back and read them. In Irene existence there are hundreds of different worlds. In all… Continue reading Book Review: The Mortal Word (|The Invisible Library #5) by Genevieve Cogman