The Lost Plot (The Invisible Library series, Band 4)

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