Fine Lines — Jim Lehrer

When four members of the Oklahoma House of Representatives, all Democrats, die in suspiciously quick succession, Mack is soon on the case, his sleuthing only slightly distracted by his entrepreneurial wife Jackie's winning a coveted award and his enterprising stepson Tommy's scheme to power diesel vehicles with a combination of methanol and fast-food grease. The politicians are done in in different ways, but all die after an about-face on a sensitive issue--about which a secretive local millionaire would rather they hadn't changed their minds.