The trans-dimensional library teeters on the brink of catastrophe - and only one book can save it. The Secret Chapter is the sixth instalment in the Invisible Library series from Genevieve Cogman.

As Irene tries to manage a fraught truce between the warring Fae and dragon factions - not to mention her overbearing parents - she's given a new mission. The world where she grew up is in danger, and only one book can save it. A book owned by a secretive Fae antiques dealer named Mr Nemo.

In 21st century Vienna, a painting holds an extraordinary secret from the past - and Mr Nemo wants it. To acquire the book and save the library, Irene and her assistant Kai must team up with an unlikely band of scheming dragons, Fae gamblers and outright thieves. Together, they must pull off an amazing art heist - and trade the painting for that book.

But some will kill to protect this painting. If Irene wants to save her world from disaster, it isn't going to be easy . . .

The spectacularly bookish fantasy continues in The Dark Archive.

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