The Day of the Dice

It's the future, but it feels like the past. Elise lives in a community of the last ten families on Earth. In the Casting, young people are paired off on the Day of the Dice. Elise, stained with illegitimacy, dreads it more than anything else.
When privileged William Derby takes an interest in her, Elise is suspicious. Their world is turned upside down when they discover that Whitecroft isn't the only population left. Elise determines to find a way to escape, but she soon finds herself falling in love. Elise faces an impossible dilemma: to lose her freedom, or the man she loves.