Retired farmer and widower Alvin Straight learns one day that his distant brother Lyle has suffered a stroke and may not recover. Alvin is determined to make things right with Lyle while he still can, but his brother lives in Wisconsin, while Alvin is stuck in Iowa with no car and no driver's license. He then has the idea of making the trip on his old lawnmower, thus beginning a picturesque and at times deeply spiritual odyssey.

An idyllic small town is rocked when Aubrey Fleming, a bright and promising young woman, is abducted and tortured by a sadistic serial killer. When she manages to escape, the traumatized girl who regains consciousness in the hospital insists that she is not who they think she is and that the real Aubrey Fleming is still in mortal danger.