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. She spies a stranger coming up the road and sees her mother speak to him. 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...

A long-lost letter arriving at its destination fifty years after it was sent lures Edie Burchill to crumbling Milderhurst Castle, home of the three elderly Blythe sisters, where Edie's mother was sent to stay as a teenager during World War II.