1914: Anticipating a long summer of freedom at her friend's family estate in Cambridge, Grace Villiers is disappointed by an unexpected addition to their party. Then the new arrival offers to teach Grace to swim, and she is forced to see there is more to Algernon Lake than his reputation. But, with war brewing across Europe, this will be a summer that changes everything.1997: Following her father's sudden death, Barbara finds herself living with her mother in a house that is, literally, falling down around them. As she tries to put their new home in order, she discovers a photograph of her grandfather as a young man with his friend - two soldiers at the start of the First World War. Setting aside her grief, Barbara becomes determined to uncover their story, hoping it will bring her closer to the family she feels slipping away.But when her search for answers opens up truths she isn't prepared for, Barbara will come to realise, some secrets may be best left alone.