A sparkling bookish adventure featuring librarian spies, stolen books and top-secret missions to alternate realities. Here Irene, Librarian spy, becomes involved in a deadly art heist - all for the sake of a rare book with a hidden history... Part of Genevieve Cogman's witty and wonderful Invisible Library series, which can be enjoyed as part of a sequence or as standalones. For fans of "Doctor Who" and "Sherlock Holmes".