The Flame Court (The Selection x Red Queen)

The war-torn kingdom of Norta is on the brink of collapse. To unify the fractured noble houses and pacify the rebelling lower classes, the royal family announces a Selection-a tradition long abandoned. Thirty-five young women from across the kingdom are brought to the palace. One will marry Crown Prince Tiberias Calore, heir to a bloodstained throne.
Mare Barrow, a red-blooded thief from the Stilts, is selected not by chance-but by design. The Scarlet Guard smuggles her into the Selection to spy on the palace, uncover Silver secrets, and find weaknesses in Cal's rule. She never expected to actually like him.
Cal never expected to fall for the most dangerous girl in the palace.
But with nobles plotting from the shadows, rebels moving beneath the floorboards, and a king who will burn the kingdom to ash before giving up control, this is not a game of roses.
It's a war dressed in silk.