Anna Kerrigan, nearly twelve years old, accompanies her father to visit Dexter Styles, a man who, she gleans, is crucial to the survival of her father and her family. She is mesmerized by the sea beyond the house and by some charged mystery between the two men. ‎Years later, her father has disappeared and the country is at war. Anna works at the Brooklyn Naval Yard, where women are allowed to hold jobs that once belonged to men, now soldiers abroad. She becomes the first female diver, the most dangerous and exclusive of occupations, repairing the ships that will help America win the war.