The first instalment of the Invisible Library series, a fantasy adventure featuring stolen books, secret agents, and forbidden societies – think Sherlock Holmes with a transdimensional twist!

Irene must be at the top of her game or she'll be off the case - permanently. Irene is a professional spy for the mysterious Library, which harvests fiction from different realities. And along with her enigmatic assistant Kai, she's posted to an alternative London. Their mission - to retrieve a dangerous book. But when they arrive, it's already been stolen. London's underground factions seem prepared to fight to the very death to find her book. Adding to the jeopardy, this world is chaos-infested - the laws of nature bent to allow supernatural creatures and unpredictable magic. Irene's new assistant is also hiding secrets of his own. Soon, she's up to her eyebrows in a heady mix of danger, clues and secret societies. Yet failure is not an option - the nature of reality itself is at stake. 'I absolutely loved this . . . flavoured with truly unique mythology and a dash of the eldritch' N. K. Jemisin

One spy. One dangerous book. One deadly mission. Discover the first book in this gripping fantasy mystery series – The Invisible Library is the astounding debut from bestselling author Genevieve Cogman.

Perfect for fans of Mr Penumbra's 24-Hour Bookstore by Robin Sloan, Jasper Fforde's The Eyre Affair or Ben Aaronovitch's Rivers of London.

'I absolutely loved this' – N.K. Jemisin, author of The Fifth Season

Irene is a professional spy for the mysterious Library, whose staff are sent to different realities to harvest dangerous and mystical fiction.

Irene has been posted to an alternative steampunk London along with her enigmatic new assistant, Kai. Their mission: to retrieve a dangerous edition of Grimms' Fairy Tales. But it has already been stolen.

In London's underground, the laws of nature have been bent – supernatural creatures and unpredictable magic stalk the land. The city is home to vampires, werewolves – factions that are all prepared to fight to the death for this book.

Irene must face a web of deadly danger, deception and secret societies. Her new assistant is hiding secrets of his own. Yet failure is not an option – the nature of reality itself is at stake . . .

Continue the journey with the adventurous second title in the Invisible Library series, The Masked City.

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' – The Guardian

'Cogman keeps upping the ante on this delightful series!' – Charles Stross, author of the Merchant Princes series