The film, based on the novel by Tom Bradby, follows a young former IRA terrorist turned informer for Blighty's MI5, who is arrested over an aborted bombing attempt in London, and who is forced to reveal her past if she wishes to see her children again.
Hall starred in the Bridge Project's productions of The Winter's Tale and The Cherry Orchard, and will appear next year in a UK production of Twelfth Night. Her screen credits include Vicky Cristina Barcelona, Frost/Nixon, and The Town.
Pearce's many film credits include The Adventures of Priscilla, Queen of the Desert, L.A. Confidential, and Memento. He will be seen later this year in The King's Speech and co-stars in the 2011 HBO miniseries Mildred Pierce.