Coming Home by Rosamunde Pilcher
Born in Colombo, Judith Dunbar spends her teenage years at boarding school, while her beloved mother and younger sister live abroad with her father.
When her new friend Loveday Carey-Lewis invites Judith home for the weekend to Nancherrow, the Carey-Lewises' beautiful estate on the Cornish coast, it is love at first sight.
She falls in love too with the generous Carey-Lewises themselves. With their generosity and kindness, Judith grows from naive girl to confident young woman, basking in the warm affection of a surrogate family whose flame burns brightly. But it is a flame soon to be extinguished in the gathering storm of war. And Judith herself has far to travel before at last ... coming home.