Actors Kate Mara and Treat Williams have joined the cast of the indie feature Blackbird for 2929 Entertainment.

The drama centers on a brother-sister pair of fugitives (Eric Bana and Olivia Wilde) who encounter a young boxer (Charlie Hunnam) recently released from prison. Treat Williams and Kate Mara will play a father and daughter whose story line is connected with the main plot. Sissy Spacek and Kris Kristofferson will play the boxer's parents.

Stefan Ruzowitzky (The Counterfeiters) will direct from a script by Zach Dean. Mark Cuban and Todd Wagner will finance the indie, which is budgeted at $25 million, through their 2929 Entertainment company.

Blackbird will start production next month in Montreal.