Setting: a beautiful futuristic skyscraper-jungle-city.
Criminals have figured out how to suborn governmental controls on the cloning/life extension vats, which every wealthy person has at home.
When targeted by the criminal gang, a rich old guy comes out of the process as a big fat lazy tabby cat, and a criminal takes on their appearance, identity, and (of course) wealth.
I, a junior officer in the secret tech police, stumble on their operation, but I'm caught and killed.