Raised in Montreal by their disinterested single mother, half-sisters Lark and Robin form a fierce team in spite of their differences. When Lark flees to America to attend college, her sister soon joins her. But even as Lark discovers a calling working in documentary film, she struggles with self-doubt, and Robin chafes against the demands of studying piano at Juilliard. Their bond strains under increasing pressure until it breaks.
Years later, Lark’s life is in tatters and Robin’s is wilder than ever. As Lark tries to take charge of her destiny, she discovers that despite the difficulties of their relationship, there is only one person she can truly rely on: her sister.