Mack and Frank are caught up in a murder investigation that leads too close to home; Karen goes up against Sumner in a TV debate on the environment; Val finally realizes how Amanda fits into the scheme of things.

Paige resents Mack and Karen's interference in her topsy-turvy personal life; lusting after his brother's wife takes a toll on Michael; Karen takes over as host of "Open Mike"; Tom refuses to play by the rules.