If ever there were a documentary that feels like a PD James murder mystery, it's "Natchez." The setup is almost too good to be true. In Natchez, Mississippi, there are eccentric boomers who belong to a "Garden Club"; each boomer leads tours through his or her own haunted mansion. Tension arises because a Black woman joins the Garden Club, and the Black woman wants her white colleagues to begin to wrestle both with slavery and with the *legacy* of slavery. The ensuing "community meeting"--with deep sighs, half-ironic statements, and the frequent clearing of throats--is a wonderfully passive-aggressive disaster. It is miraculous that someone agreed to have a camera present for this event. That's frequently the case throughout the movie--people say terrible things. People say these things on camera! The filmmaker must have counted her lucky stars night after night after night. (It's unfortunately a cliche of documentary filmmaking that the final ...