The Amazon summary is a little bizarre:
"Eden Newman must mate before her 18th birthday in six months or she'll be left outside to die in a burning world. But who will pick up her mate-option when she's cursed with white skin and a tragically low mate-rate of 15%? In a post-apocalyptic, totalitarian, underground world where class and beauty are defined by resistance to an overheated environment, Eden's coloring brands her as a member of the lowest class, a weak and ugly Pearl. If only she can mate with a dark-skinned Coal from the ruling class, she'll be safe. Just maybe one Coal sees the Real Eden and will be her salvation her co-worker Jamal has begun secretly dating her. But when Eden unwittingly compromises her father's secret biological experiment, she finds herself in the eye of a storm and thrown into the last area of rainforest, a strange and dangerous land. Eden must fight to save her father, who may be humanity's last hope, while standing up to a powerful beast-man she believes is her enemy, despite her overwhelming attraction. Eden must change to survive but only if she can redefine her ideas of beauty and of love, along with a little help from her 'adopted aunt' Emily Dickinson."
If I were going to adopt an aunt, it wouldn't be Emily Dickinson. That's all I can really say.