The Blythe Girls: Margy’s Secret Mission or Exciting Days at Shadymere (Blythe Girls #6). Laura Lee Hope. Grosset and Dunlap, 1926. First edition. Original dust jacket. Helen, Margy, and Rose settle back into their daily life in the city, but not without more problems. Rex Pepper continues to attempt to steal Miss Pepper’s fortune, and Helen may have lost her only source of income after Mr. Bullard is swindled in a stock scam.