Katharine Norbury was abandoned as a baby in a Liverpool convent. Raised by loving adoptive parents, she grew into a wanderer, drawn by the landscape of the British countryside. One summer, following the miscarriage of a much-longed-for child, Katharine sets out – accompanied by her nine-year-old daughter, Evie – with the idea of following a river from the sea to its source. The luminously observed landscape provides both a constant and a context to their expeditions. But what begins as a diversion from grief soon evolves into a journey to the source of life itself, when a chance circumstance forces Katharine to the door of the woman who gave her up all those years ago.