While her father is at war, five-year-old Rosalie is a captain on her own secret mission. She wears the disguise of a little girl and tracks her progress in a secret notebook. Some evenings, Rosalie's mother reads aloud Father's letters from the front lines, so that Rosalie knows he is thinking of her and looking forward to the end of the war and to finally coming home. But one day a letter comes that her mother doesn't read to her, and Rosalie knows her mission must soon come to an end.