Mary Poppins Opens the Door Mary Poppins Opens the Door Mary Poppins Opens the Door is a British children's fantasy novel by the Australian-British writer P.L. Travers, the third book and last novel in the "Mary Poppins" series that features the magical English nanny Mary Poppins. It was published in 1943 by Harcourt, Brace & World, Inc and illustrated by Mary Shepard and Agnes Sims. On Guy Fawkes Night, Mary Poppins arrives in the wake of the last fireworks display by the Banks family. The Banks children Michael, Jane, the twins, and Annabel plead with her to stay. She reluctantly agrees to do so "till
Mary Poppins Returns script. On February 18, 2016, Emily Blunt was cast in the film to play the title role in the sequel. On February 24, 2016, Lin-Manuel Miranda was cast in the film to play Jack, a lamplighter. In April 2016, Disney confirmed that the film was in development and that Blunt and Miranda had been cast in the lead roles. In May, Disney announced the film's title as "Mary Poppins Returns". By July 2016, Meryl Streep had entered negotiations to join the cast to play cousin Topsy, and in the following month, Ben Whishaw in negotiations to play the grownup Michael