The Girl Who Dared to Stand by Bella Forrest

Liana Castell's journey continues in the breathtaking second book of the bestselling The Girl Who Dared to Think series.
After stumbling upon an ancient, dusty office sealed away from the rest of the Tower, Liana makes a shocking discovery. Her first instinct is to flee - until she realizes all is not what it seems. 
The room has been hidden for a reason. It holds secrets about the Tower's past, and answers that could be key to her people's future. But with this knowledge comes grave danger, as Liana will quickly discover...