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.