The Balloon Thief Aneesa Marufu

The year's must-read YA fantasy - ancient djinn, an epic adventure, and one girl's courage to seek her own destiny ... 
Burn the flame. Seek the night.
For Khadija, the only escape from her father's arranged betrothal is the sky.
When she spots a rogue hot air balloon fighting against its ropes, she leaps at the chance for adventure. Khadija soon finds an unlikely ally in a poor glassmaker's apprentice, Jacob.
But Jacob is a hāri, and Khadija a Ghadaean. The hāri are oppressed and restless - their infamous terrorist group, the Hāreef, have a new fearsome leader. And the ruling Ghadaeans are brutal in their repression.
Soon, a deadly revolution threatens their friendship and their world. The Hāreef use forbidden magic, summoning jinn - wicked spirits made of fire - to enact their revenge, forcing Jacob and Khadija to choose what kind of a world they want to save ...