What was supposed to be a pleasure cruise to Mexico becomes a working vacation for Lt. Columbo in "Troubled Waters." Also on board is used car kingpin Robert Vaughn, who kills the lounge singer who's blackmailing him, while pinning the murder on her piano-playing ex. Though the crew is more than willing to buy the frame-up, Columbo can't let it go, even on his vacation. Poor Mrs. Columbo. Back to travel the high seas of crime with Jon and RJ is comedian Richard Massara.