Harley Milano has dreamed of becoming a trapeze artist for as long as she can remember. With parents who run a famous circus in Las Vegas, she spends almost every night in the big top watching their lead aerialist perform, wishing with all her heart and soul that she would be up there herself one day.

After a huge fight with her parents, who continue to insist she go to school instead, Harley leaves home, betrays her family, and joins the rival traveling circus Maison du Mystère. There, she is thrust into a world that is both brutal and beautiful, where she learns the value of hard work, passion, and collaboration. At the same time, Harley must come to terms with the truth of her family and her past—and reckon with the sacrifices she made and the people she hurt in order to follow her dreams.