Summer 1939: After touring an unsettled Europe to promote her latest book, Romily Temple returns home to Island House and the love of her life, Jack Devereux. But when Jack falls ill, his estranged family are called to his bedside. With war now declared, each member of the family is reluctantly forced to accept their new stepmother and confront their own shortcomings. But can Romily cope with the life that has been so unexpectedly thrust upon her?