In Aelya humans and demons coexist, but they must not love each other, because from their love halfbloods are born. 
Nayla is a halfblood, she hides herself from demons and pretends to be a human. She isn't only a halfblood, but she's a servant, a slave too, but her difficult situation doesn't make her give up on life.
    
She won't live anymore in the shadows after she meets a group of demons willing to help her.