Behind the Green Door

Behind the Green Door is Mildred A. Wirt’s fourth novel in her wholesome girl detective series featuring the curious and daring Penny Parker.

Penny visits a ski resort and stumbles upon several mysteries. Unknown enemies are trying to force the resort to close, and during her investigations, Penny discovers a mysterious green door in the resort that leads to a room that can only be entered by invitation. Meanwhile, a new acquaintance offers to sell Penny a fur coat inexpensively. Penny investigates, solving all of the mysteries, scoops a rival reporter, and is rewarded with a new car.


Mildred Augustine Wirt Benson (1905 – 2002) was an American journalist and writer of children's books. She wrote some of the earliest Nancy Drew mysteries and created the detective's adventurous personality. Benson wrote under the Stratemeyer Syndicate pen name, Carolyn Keene, from 1929 to 1947 and contributed to 23 of the first 30 Nancy Drew mysteries, which were bestsellers.