Greenshift by Heidi Ruby Miller

In this caste-ruled society, celebrity, beauty, and power mean everything and multiple partners are the norm. Love and jealousy are considered emotional fallacies, nothing more than fleeting moods and sentiments biased by hormones. But sometimes people just fall in love…and that can be deadly.

Mari’s rare eye color makes her a pariah within Upper Caste society, which is why she prefers plants to people…except David, the former Armadan captain who shuttles scientists around on a refurbished pleasure cruiser.

But someone else is interested in Mari and her distinctive look–an obsessed psychopath who tortures and murders women for pleasure.

When the killer chooses Mari as his next victim, the soldier inside David comes alive, but it is Mari who must fight for her own life and prove she isn’t as fragile as the flowers she nurtures.