Scott Hicks (Heart of Atlantis, Shine) will direct the project with a script written by Carol Fuchs.
Filming for the movie is set to begin in January.
The story follows Martha as her life changes when she becomes the guardian of her niece.
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Harrison Ford Joins Manhunt
Catherine Zeta-Jones (The Legend of Zorro, Chicago) will play a high-powered chef in the Castle Rock romantic comedy, Mostly Martha.