The Astral Library is a magical realism novel by Kate Quinn, her first foray into fantasy, about a young woman named Alix Watson who discovers a hidden, magical library where people can live inside books, and must protect it from a shadowy enemy. The story follows Alix as she navigates this fantastical world, traveling through classic stories like Around the World in Eighty Days, while fighting to save the library and its patrons. It combines themes of the joy of reading, finding purpose, and the importance of libraries with a thrilling adventure.