The Nightrider uncovers the disturbing truth about the murder, 28 years ago, of black civil-rights leader Medgar Evers by the Ku Klux Klan. His widow tells of her obsessive hunt for the man whom she believes to be the killer of her husband. He is a white supremacist who "confessed" to the murder at a Klan rally, was tried by the courts but not convicted. He is due to stand trial again soon. The programme, which is a part-dramatisation of events, uncovers new evidence and makes it horrifyingly clear that in the Mississippi swamplands racial hatred remains a reality. Indeed, filming took place in an atmosphere of increasing tension that culminated in the production team being shot at.