Billy Magnussen and Julia Stiles Join "The Great Gilly Hopkins" Film

Tony Award nominee Billy Magnussen and Julia Stiles have joined the cast of "The Great Gilly Hopkins," the new film adaptation of the Katherine Paterson novel of the same name, according to

Billy Magnussen
Billy Magnussen

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.