On her deathbed, Isobel-mother, wife, and hat maker-recalls the haunting and fateful summer of 1936 when her world was transformed. After her husband Victor takes their sons away for the summer to a remote island, Isobel meets Cathryn, a woman who will forever change the way she looks at life. An intimate story of friendship, a portrait of marriage, and a glimpse into the depths of loss, the events of this summer become the prism that refracts the essence of Isobel's life.