Spark of Resistance by Tony James Slater

They stole her planet.
She wants it back.
When the Revenants descended on the peaceful planet of Esper, they came as friends. They came to solve a problem… and they did.
They just refused to leave again afterwards.

Now, held hostage on her own world, young Princess Kylimnestra is determined to save her people from the brutal nightmare of occupation.
She never asked to be a hero, but no-one else seems to want the job.

As fire rains from the sky and innocent civilians are cut down in the street, fear engulfs the population. All their defenders are gone – except for one spoiled little rich girl, who’s lived her whole life in the palace.
Lucky for them, she always did have a rebellious streak…