Ash Princess by Laura Sebastian

When Princess Theodosia of Astrea was six, her life was ripped apart. Her peaceful island nation was invaded by the fearsome Kalovaxians, her mother slaughtered, and her people enslaved. Over a decade later, Theodosia is still imprisoned in the palace she once called home. Theodosia is forced to watch as the Keiser runs her country into the ground, and slaughters her people, as each small act of rebellion is etched onto her back with the Theyn’s whip. But with the reappearance of a childhood friend, everything changes. Theodosia has been the Keiser’s pawn for too long, and for better or worse, she soon finds herself a Queen in a perilous game of deception and betrayals. One wrong move means death, and if she wants to win, Theodosia will have to be cunning, brave, and ruthless in order to save her people— and herself.
Theodosia is by far the smartest— and possibly the most ruthless protagonist I have ever read. She’s cunning, manipulative, brave, and unlike most heroes, has excellent survival instincts. But she’s also human, and even as she gets closer to her goal, she finds herself inexorably drawn to the crown prince that she swore to kill. Theodosia soon finds herself trapped, caught between her people, and the boy she may be growing to love.

Ash Princess is a beautiful and heartbreaking story of a girl who has lost everything, and is willing to do anything in order to survive. The writing is beautiful and compelling, the characters diverse and colorful, and the plot a masterpiece of twisting, interlocking tales. Ash Princess is undoubtedly one of the best fantasy novels that can be found on the YA shelf.