Freddie Highmore and Sarah Bolger have been cast as the three Grace children in the fantasy film The Spiderwick Chronicles, which Paramount Pictures and Nickelodeon Movies will been shooting Sept. 12 in Montreal.

The Hollywood Reporter says Mark Waters will direct the film from a screenplay by John Sayles based on the best-selling series of children's books by Holly Black and Tony DiTerlizzi. In the movie, the three Grace children move to the ancient Spiderwick mansion, where they discover Brownie, an enchanted creature who introduces them to a world of goblins, fairies and sprites.