1976. Rushing out of the University Library, undergraduate Alice Kenzie bumps straight into PhD student Tristan Somers. There begins a whirlwind romance, and Alice falls pregnant and gives birth to a baby girl. Then Tristan is killed in a car accident. Unable to cope, Alice takes her baby to Summer House, Tristan's family home in Suffolk, leaves her there and disappears.

2018. Olivia Somers has always been told that her mother died in the same accident as her father. But when she finds a bundle of old letters in Summer House, everything she ever believed about her mother is called into question. Can she find her - and even more importantly, forgive her?