A secret letter. A wartime promise. A courageous act of love...

Singapore, 1942: The war is drawing ever closer, and Dorothy faces a heart-rending choice to flee the country she has come to call home. With warplanes advancing across the ocean, she is boarding a boat full of evacuees when something is urgently pressed into her arms.

As enemy fire cuts off all escape routes, Dorothy makes a promise that will echo through the years...

England, 2019: When her beloved grandmother, Dotty, passes away aged one hundred, Annabel discovers letters and photographs hidden in her desk that document a secret life as a young woman in Singapore. But Dotty has never travelled further than her small village in Cornwall... What could have made her conceal this past life? And who is the bridegroom standing proudly next to Dotty in a faded wedding photo, who is clearly not Annabel's grandfather?

Determined to uncover the truth, is Annabel prepared for what she will find?