Mrs. W. G. Waters, most likely pseudonym for Emily Waters, was the author of a cookbook titled "The Cook's Decameron: A Study In Taste, Containing Over Two Hundred Recipes For Italian Dishes". Published in 1901, the book offered a unique approach. It framed the recipes as a story inspired by Giovanni Boccaccio's Decameron [Wikipedia: The Cook's Decameron].
While not much biographical information is available about Mrs. W. G. Waters herself, we do know some things from her work. She was clearly knowledgeable about Italian cuisine and presented over 200 recipes in her book. The book's success led to a sequel, "Just a Cookery Book", published in 1920.
Interestingly, it seems Mrs. W. G. Waters may have also been a skilled classicist. Collaborations with her husband, William George Waters, on translations of Italian Renaissance literature have been noted.