After Rebecca's mother dies, Olivia, her mother's elderly cousin, needs help to save her beloved home. Rebecca immediately goes to visit Olivia in Cornwall only to find a house full of secrets - treasures in the attic and a mysterious tunnel leading from the cellar to the sea. Rebecca sets to work restoring the home to its former glory, but as she peels back the layers of paint and grime, she uncovers even more buried secrets - secrets from a time when the Second World War was raging, when Olivia was a young woman, and when both romance and danger lurked around every corner ...