Jaden Smith and Liev Schreiber have signed on to star in the slavery drama The Good Lord Bird, an adaptation of James McBride's book of the same name.The story centers on a young slave named Henry "Onion" Shackleford (Jaden Smith), who skips town with abolitionist John Brown (Liev Schreiber). Onion travels the nation with Brown, who believes the slave is actually a girl, and his crew of freedom fighters, meeting historical figures such as Harriet Tubman and Frederick Douglas on the way to the brutal Harper's Ferry raid that helped set the stage for the Civil War.