When an English quartet, the Maggiore, undertakes a challenging work of Beethoven's, violinist Michael Holme is overwhelmed by memories of mastering the piece as a student in Vienna. That's where he also met Julia McNicholl, a pianist whose beauty was as mesmerizing as her musical genius, and whom Michael loved with an intensity he never found again.

Years later, Michael is living a life devoted to music, until one day he is riding a London bus, and there, on another bus, separated only by glass, sits Julia McNicholl.

Though the mutual passion flares anew, the love they shared in their younger days is now complicated by the secrets and silences that have been generated by the passing of years. Unable to resist the power of their shared history, however, Julia agrees to tour Vienna and Venice with Michael and the Maggiore Quartet.

Against the magical backdrop of concert halls and canals, Michael and Julia must confront the truth about their love for one another, their love for the music that brought them together, and the true consequences for their tangled hearts.