Bill Gillespie is a police chief in a small town in the American South, and later becomes sheriff of the county. As Bill tries to solve crimes and catch criminals, aided by his capable investigator Virgil Tibbs and police lieutenant Bubba Skinner, he must navigate tricky small-town politics. Racial tensions often run high in the South and this theme is frequently explored. Bill's personal life is often portrayed in this TV drama, as well.