During a party at the family farm in the English countryside, sixteen-year-old Laurel Nicolson has escaped to her childhood tree house and is dreaming of the future when she sees her mother speak to a stranger. Before the afternoon is over, Laurel will witness a shocking crime that challenges everything she knows about her family and especially her mother, Dorothy.
Now, fifty years later, Laurel is a successful and well-regarded actress, living in London. She returns to the family farm for Dorothy's ninetieth birthday and finds herself overwhelmed by questions she has not thought about for decades. From pre-WWII England through the Blitz, to the fifties and beyond, she begins to unearth the secret history of three strangers from vastly different worlds -- Dorothy, Vivien, and Jimmy -- who meet by chance in wartime London and whose lives are forever entwined.