Reflection: The Stranger in the Mirror (Records of the Ohanzee Book 1) by Rachel R. Smith

The night of the masquerade celebrating a thwarted assassination attempt on the Royal Family is approaching, and this year Nerissa has a plan. Ever since she was named Heiress, she has wondered whether others liked her for who she is or for her title. On this night, she can be free to enjoy the revelry in blissful anonymity. All she needs to do is feign illness, change into a second costume she’s prepared in secret, and then slip back into the party unrecognized.
She doesn’t know that a warning of another assassination attempt is on its way to the capitol.
She doesn’t know that a prophecy, hidden away for centuries, has just been rediscovered—and the events it foretells are already in motion.
She doesn’t know that an ancient power, lost for so long that the memory of it has been forgotten by the ages, is about to reawaken.
She doesn’t know that the real masquerade is only beginning.