Rising star, Barnhill saw her breakout role last year in Steven Spielberg’s “The Bfg,” opposite Mark Rylance. The actress will take the title role in “Mary and the Witch’s Flower,” which follows the adventure of a young girl who discovers a mysterious flower that can give her the power to become a witch for one night and a school of magic that is not quite what it seems. It is based on a 1971 children’s novel, “The Little Broomstick,” by British author Mary Stewart.
Winslet will play Madam Mumblechook, the head of the school. Winslet’s Oscar-winning “Iris” co-star Jim Broadbent will also