The Invisible Library, written by Genevieve Cogman, is an exciting gaslamp fantasy novel that combines elements of fantasy, mystery, and adventure. The story follows Irene, a librarian who works for the mysterious Invisible Library, which exists outside of time and space. Irene's job is to retrieve rare books from different realities, but her latest mission becomes a dangerous quest filled with treacherous villains and unexpected allies. With its fast-paced plot and imaginative world-building, The Invisible Library is a thrilling read.