Stiles (Oleanna) will play the mother to young protagonist Gilly, who will be portrayed by "The Book Thief" star Sophia Nelisse. Magnussen ("Into the Woods," Vanya and Sonia and Masha and Spike) will portray the young girl's social worker.
Also cast are Kathy Bates, Octavia Spencer, Glenn Close and Bill Cobbs.
The film centers around the young girl's desire to be reunited with her mysterious and exotic mother, according to Deadline. It is currently filming in New York City. The book was adapted for screen by Paterson's son, David Paterson.
