The fourth instalment in this thrilling fantasy adventure series, filled with twists and turns. Irene is on a top-secret mission to an alternate, 1920s USA – and she cannot afford to fail. Perfect for fans of Ben Aaronovitch and Doctor Who.

It’s time for a cunning plan If only Irene could find one In an alternative 1920s America, Prohibition is in force, fedoras, flapper dresses and tommy guns are in fashion – and intrigue is afoot. Two dragons are vying for high office, and their last challenge is to hunt down a rare book. Librarian spies Irene and Kai are assigned to investigate, as a young Librarian is trapped at the heart of this conflict. If they can’t extricate him, the Library will face severe political repercussions. It could even trigger war. So to avert disaster, the Librarians will face no-holds-barred gangsters, blackmail and fiendish security systems. But failure could have dire consequences for Irene’s job – and for her life. PRAISE FOR THE SERIES `A breath of fresh air’ Guardian `Reminiscent of the works of Diana Wynne Jones and Neil Gaiman’ Publishers Weekly

Enter a world of dragon politics and missing librarians – in 1920s New York City. Immerse yourself in The Lost Plot, the fourth gripping instalment in the Invisible Library series from Genevieve Cogman.

A covert mission. A royal demand. And a race against time.

In a 1920s-style America, Prohibition is in force, fedoras and flapper dresses are in fashion – and intrepid librarians Irene and Kai find themselves caught in a fierce dragon duel.

A demanding queen has ordered her heirs to find a rare book, and it seems a young librarian has become tangled in the conflict. If Irene and Kai can't extricate him, there could be grave political fallout for the library. This could even trigger war.

Irene and Kai's quest: to outsmart gangsters, evade security, rescue the librarian and retrieve the book. If they can't, it could have dire consequences for Irene's job. And, incidentally, for her life . . .

Continue the literary magic with The Mortal Word, the next step in this enchanting historical fantasy.

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