Yesterday was about honor. Today is about justice.
Bob Lee Swagger (Mark Wahlberg) - an ace marksman living in self-exile in the Arkansas wilderness after causing the death of an innocent person - is persuaded by his former associates that they need his help to prevent an assassination and who is subsequently double-crossed and framed for the presidential assassination he was trying to prevent. He is forced to go on the run while trying to track down the real killer and discover the truth about who betrayed him.