Lt. Columbo, America's favorite TV detective, must unravel the mystery that has held the world's attention for thirty years. Suddenly, controversial talk-show host Paul Drury is silent - murdered in his hillside mansion. Discounting burglary as a motive, Columbo soon finds out how many people had reason to kill the arrogant celebrity. Alice Drury, his beautiful ex-wife. Bobby Angele, top country singer. Jessica O'Neill, famous movie star. But Columbo's next discovery is more startling still. Someone sabotaged the broadcast of Drury's final show, which promised to expose JFK's real assassin. Now, the computer files of that show are gone - perhaps destroyed by the killer of Paul Drury? Before Columbo solves this mystery, he has to deal with another: Thirty years ago in Dallas, who shot JFK?