Mrs. Mason ran the Portsmouth boarding house that Hornblower stayed at during his demobilization during the Peace of Amiens.
She was a short, brusque woman, with a hard face. She lived in her boarding house on Highbury Street with her daughter, Maria, and maid Susie.
She was delighted when her daughter married a naval officer, and even had an admiral turn up at their wedding.
Mrs. Mason was portrayed by Barbara Flynn in the Hornblower TV series.