Librarian Note: There is more than one author in the GoodReads database with this name. *Marguerite Marie Dominique Monro Arnold (1879-1969), British novelist. aka Margot Arnold. *Petronelle Marguerite Mary Crouch Cook (1925-2016), British-American novelist, author of Penny Spring and Sir Toby Glendower Series aka Petronelle Cook and Margot Arnold.