The Invisible Library, written by Genevieve Cogman, is an exciting gaslamp fantasy novel that combines elements of steampunk and adventure. The story follows Irene, a librarian who works for the mysterious Invisible Library, which exists outside of time and space. Her mission is to retrieve rare and unique books from different alternate realities. As Irene embarks on a dangerous mission to retrieve a valuable book, she faces supernatural creatures, treacherous villains, and unexpected allies.