Mississippi Burning (1988)

In 1964, when three civil-rights workers, two white and one black, mysteriously disappear while driving through Mississippi, two FBI agents, Ward (Willem Dafoe) and Anderson (Gene Hackman), are sent in to investigate. While Ward is young and by the book, Anderson is a seasoned southerner comfortable with the Byzantine (and, to Ward, morally ambiguous) ways of his region. Together they sift through a variety of leads and come up empty-handed--until the town sheriff’s wife (Frances McDormand) steps forward and reveals some surprising information. In order to solve the case, the two contrasting agents must not only overcome the hostility of the local authorities and the black community but contend with their own differences as well.