Lady Smoke, by Laura Sebastian
The Kaiser murdered Theodosia's mother, the Fire Queen, when Theo was only six.
Theo no longer wears a crown of ashes. She has taken back her rightful title, and a hostage--Prinz Soren. But her people remain enslaved under the Kaiser's rule, and now she is thousands of miles away from them and her throne.
To get them back, she will need an army. Only, securing an army means she must trust her aunt, the dreaded pirate Dragonsbane. And according to Dragonsbane, an army can only be produced if Theo takes a husband. Something an Astrean Queen has never done.
Theo knows that freedom comes at a price, but she is determined to find a way to save her country without losing herself.