September, 1937. Kitty Travers enrols at the Conservatoire on the banks of the Seine to pursue her dream of becoming a concert pianist. But then war breaks out and the city of light falls into shadow. Nearly twenty-five years later, Fay Knox, a talented young violinist, visits Paris on tour with her orchestra. She barely knows the city, so why does it feel so familiar? Soon touches of memory become something stronger, and she realises her connection with these streets runs deeper than she ever expected.