Scotland, 1940: The Fronsac, a French warship, blows up in the Firth of Clyde. The disaster is witnessed by three locals. Jackie, a young girl who thinks she caused the explosiong by running away from school. Her mother Helen, a spirited woman married to a dreary young officer; and their lodger, a Polish soldier whose country has just been erased from the map by Hitler and Stalin.
All their lives will be changed by the death of the Fronsac.