If I recall correctly, Lee Grant won or was nominated for an award for her great performance of Leslie Williams, a cold blooded killer and confident lawyer who is both arrogant and greedy. She exhibits no remorse whatsoever during the entire episode, as we get to see her coldly murder her influential husband. She manipulates the detective in charge, but when the husband's body finally surfaces, Columbo is in charge and he sees right through Leslie, even when she falls apart at the bad news in front of several people. Without describing in detail the rest of the episode, there are some memorable scenes which has Columbo attempting to fly Leslie's plane, and how Leslie's step daughter Margaret constantly hounds her, because she feels that Leslie murdered her father. I thought perhaps there was a bit too much Margaret, as her tirades towards her step mother go on and on for much of the latter half of the segment. Anyhow, you'll have to sit through close to 2 hours before we finally get to the underwhelming finale when Columbo finally arrests Leslie, which seems slightly convenient rather than grand.
This is a solid season 1 episode, and watch for the fine portrayal by Lee Grant, who makes this Columbo a memorable one. Peter Falk also does a fine job as he's on the hunt after the killer.