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. Genevieve is also the author of the Sunday Times bestselling Scarlet - which reimagines the tale of the Scarlet Pimpernel, but with vampires, mages and magic. . .

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