The crime
Chilean private investigator Rómulo Aitken has a client who believes that her elderly mother may be the victim of theft and abuse at the mother's retirement facility. To see if there's any truth to the allegations, Rómulo installs Sergio Chamy, a recent widower in his eighties, as an undercover resident at the home.

The story
…probably sounds identical to Netflix's recent Ted Danson-starring sitcom, A Man on the Inside, and that's because functionally it is. Man is inspired very directly on Maite Alberdi's Oscar-nominated 2020 documentary, The Mole Agent, and really doesn't differ from the unscripted "original" in any of the major particulars; if you've seen Man, you know what happens in Mole.

(If you haven't seen Man and wish to avoid spoilers, skip to my last graf.)