Serie episode or telefilm of the 90's.
The investigation leads the main protagonist, a relatively fat detective in his old 50's into a luxurious mansion. He has to dive in the swimming pool to recover jewels hidden under water. Meanwhile, the bad girl, a haughty posh in her early 20's is getting dress in her room, as she puts her alluring swim-suit on her attractive body, she contemplates her flawless reflection into the mirror.
As the right guy manages to fish the precious stones out, the bitch only has to collect her booty by the water. Then, she intempts to kill him by closing the swimming-pool cover and opening the water flow. He finally gets out breaking through the cover whereas she fails to drive her hot car out.