Edie Burchill and her mother have never been close, but when a long lost letter arrives with the return address of Milderhurst Castle, Kent, printed on its envelope, Edie begins to suspect that her mother’s emotional distance masks an old secret. Evacuated from London as a 13-year-old girl, Edie’s mother is chosen by the mysterious Juniper Blythe, and taken to live at Milderhurst Castle with the Blythe family.

Summer 1924: On the eve of a glittering society party, by the lake of a grand English country house, a young poet takes his life. The only witnesses, sisters Hannah and Emmeline Hartford, will never speak to each other again. Winter 1999: Grace Bradley, 98, one-time housemaid of Riverton Manor, is visited by a young director making a film about the poet's suicide. Ghosts awaken and memories, long consigned to the dark reaches of Grace's mind, begin to sneak back through the cracks.

The present: Emilie de la Martiniéres has always fought against her aristocratic background, but after the death of her glamorous, distant mother, she finds herself alone in the world and sole inheritor of her grand childhood home in the south of France. An old notebook of poems leads her in search of the mysterious and beautiful Sophia, whose tragic love affair changed the course of her family history. 

Troubled by recent loss, Grania Ryan has returned to Ireland and the arms of her loving family. It is here, on a cliff edge, that she first meets a young girl, Aurora. Strangely drawn to Aurora, Grania discovers that their families are deeply entwined. From a bittersweet romance in wartime London to a troubled relationship in contemporary New York, the Ryans and the Lisles have been entangled for a century.

Thirty-eight year old Cassandra is lost, alone, and grieving. Her much loved grandmother, Nell, has just died and Cassandra, her life already shaken by a tragic accident 10 years ago, feels like she has lost everything known and dear to her.