Based on Macbeth, William Shakespeare’s timeless tale of intrigue, murder and struggle for power, Billy Morrissette’s Scotland, PA is a dark comedy that that centers on Joe “Mac” McBeth (James LeGros) and his wife, Pat McBeth (Maura Tierney), a young, ambitious couple who hatch a sinister plan to take over their local fast food joint in rural Pennsylvania, circa 1975.