In a small rosewood box, Matt's mother had kept her memories of his childhood. Amongst them are many photos of him as a little boy. But something about them has always puzzled Matt – is that really him? Why did he not remember those clothes? The toys? And where, in these photos, is his sister Imogen? He wrestles with an odd lack of recognition – a strange unsettling feeling that something is not quite right. Meanwhile, Imogen is living with her husband, a country vet, and their gorgeous baby in a rented cottage. Since their childhood, she and Matt have both adored the beautiful Summer House – a charming building in the grounds of an ancient house on Exmoor. Now they have the chance to buy. Imogen's marriage is threatened when her husband refuses to move. But this cherished building must stay in the family, for it is within the Summer House that tragic secrets are finally unlocked – secrets that have affected Matt's whole life ...