Who wrote the story to which Something in the Walls was a slight variation? 
Something in the Walls:  The episode is a variation of the 1892 short story "The Yellow Wallpaper" by Charlotte Perkins Gilman. The Yellow Wallpaper:  A Story") is a 6,000-word short story by American writer Charlotte Perkins Gilman, first published in January 1892 in "The New England Magazine".
Charlotte Perkins Gilman