A grand jury witness, who was to testify against a mobster, is killed by a grenade at the courtroom. Also killed is a friend of Shaft who was at the courtroom to get married. Shaft is determined to catch the hit man, who he briefly saw, and decides to set himself up as a decoy to do so. The killer is also a devoted family man whose wife is catching on to what he really does for a living. (thetvdb.com)