A mysterious archive. A powerful enemy. And a cunning plan. Danger is part of the day job for a Librarian spy. So Irene's hoping for a relaxing weekend. However, her jaunt to Guernsey proves no such thing. Instead of retrieving a rare book, she's almost assassinated, Kai is poisoned and Vale barely escapes with his life. Then the attacks continue in London - targeting those connected with the Fae-dragon peace treaty. Irene knows she must stop the plot before the treaty fails. Or someone dies. But when Irene and friends are trapped underground, in a secret archive, things don't look so good. Then an old enemy demands vengeance, and a shocking secret is revealed. Can Irene really seize victory from chaos? The Dark Archive is the seventh book in the Invisible Library series by Genevieve Cogman. Praise for the series: 'I absolutely loved this' - N. K. Jemisin, author of The Fifth Season 'Irene is a great heroine: fiery, resourceful and no one's fool' - Guardian 'Brilliant and so much fun. Skullduggery, Librarians, and dragons - Cogman keeps upping the ante on this delightful series!' - Charles Stross, author of the Merchant Princes series