About Grace and Fury by Tracy Banghart
In a world where women have no rights, sisters Serina and Nomi Tessaro face two very different fates: one in the palace, the other in prison.
Serina has been groomed her whole life to become a Grace—someone to stand by the heir to the throne as a shining, subjugated example of the perfect woman. But when her headstrong and rebellious younger sister, Nomi, catches the heir's eye, it's Serina who takes the fall for the dangerous secret that Nomi has been hiding.
Now trapped in a life she never wanted, Nomi has only one way to save Serina: surrender to her role as a Grace until she can use her position to release her sister. This is easier said than done. A traitor walks the halls of the palace, and deception lurks in every corner. But Serina is running out of time, imprisoned on an island where she must fight to the death to survive and one wrong move could cost her everything.