Wing is the lead mare of her herd, and Night is her partner, the herds only stallion. Together, they watch over and protect the young and the old from the dreaded sky beast. Many of their herd had been taken by the wild mustang roundup held yearly. The mustangs fear the time when the helicopters come and chase them down for miles, separating them from one another and mixing them with other herds. Wing tries her best to protect her herd and lead them to safety, but she finds herself separated and farther from her home than ever. To her dismay, she finds herself with a girl named Bird. Bird has grown up around wild mustangs her whole life. Both her parents own and train wild mustangs rescued from auction. Along with training wild mustangs, her parents opened up their farm and their home to troubled teens from all over. So despite being an only child, at times Bird feels overlooked by her parents. Bird hates feeling babied by her parents, and all she really wants is a mustang of her own. Can Wing and Bird connect, or will she be wild forever?