The Masked City by Genevieve Cogman is the second in series that got off to a great start with the Invisible Library.  I think that this book could probably be read as a standalone however I would personally recommend reading the first in series because it’s just so good.  I will forewarn you that whilst I will try to avoid spoilers for The Masked City the review may contain spoilers for the first book so please bear that in mind. By way of context the Invisible Library is a library that exists in a different dimension.  From within there appear to be no boundaries and the library is a vast labyrinth that can take days if not weeks to traverse.  The role of the Librarians is to travel to alternate worlds and recover books that are about to disappear and then preserve those books for all time. Using an unusual form of magic the librarians are able to travel to alternate worlds by stepping through a portal within the library and coming out in a library ‘elsewhere’.  The number of possible alternate worlds is immense and each one is different in terms of magical ability or occupants.  In the first…