 Philadelphia Detective Dwight Walker calls Virgil Tibbs, planning to come to Sparta for the twins  birth after he wraps up a big case. Dwight sees three Philadelphia policemen break up a drug buy and kill the buyer and pusher. Dwight then is found hanged at home. Celia, Dwight s wife, asks Virgil to help find the killers. Meanwhile, Bubba Skinner is drafted to assist Althea with her Lamaze classes.