Sir Alexander Bradshaw needs a wife, a sensible woman to manage his unruly sons and sullen daughter. No suitable candidates appear, however, and Alec resigns himself to spend another long, dark Orkney winter companionless. When an acquaintance suggests a music teacher might occupy his daughter, he embraces the idea.

Ann Dunwood travels to Orkney for the opportunity to play the Kirkwall organ. For the beauty of the instrument, Ann endures the conservative choir members who wish to perform the most banal of hymns; she’s done it before. She knows how to fade into the shadows and keep to her place.

When he happens upon Ann in the cathedral, Alec is enchanted by the woman at the keyboard, who fills the room with a Bach fugue. Yet, when the music ends, the object of his fascination turns into a demure mouse. Alec determines to reignite the passion he glimpsed in her and fill his home with music.