Fans of the Invisible Library series will revel in the latest entry, which pulls together plot threads from previous books to set up an intricate grand conspiracy that threatens to knock the foundation out from under Irene, make her question everything she believes in, and put her in an impossible position where she will have to fight with all her strength to save herself and her friends and allies.

A great story that fans of the series will love, but newcomers will absolutely have to read previous entries to make sense of some of the things happening in this one, so don't try to jump into the series with this one.