Summer 1967: As an artist paints a portrait of thirteen-year-old Maisie and her older sisters-arrogant, beautiful Julia and brilliant, bookish Finn-Maisie embarks upon a portrait of her own: a secret account of her troubled family and her village friend Daniel. Before the end of the summer, a terrible accident will befall the family.

Winter 1991: As the now-legendary portrait of the Mortland sisters is featured in a London retrospective, Daniel seeks to free himself of his obsession with the mysterious sisters by unraveling the secrets of that fateful summer…