[6] A private investigator (Rómulo Aitken) has a client who alleges that her mother, Sonia, is being mistreated by staff in a nursing home in El Monte, Chile.

After conducting his investigation, Sergio concludes that Sonia is being treated well, except for one instance when the nurses forget to give her medication.

The critical consensus reads "Warm and funny, The Mole Agent offers audiences a poignant reminder that it's never too late to forge new connections and embark on new adventures.

"[13] On Metacritic the film has a weighted average score of 69 out of 100, based on 13 critics, indicating "generally favorable reviews".

[15] Nick Allen of RogerEbert.com rated the movie three stars out of four writing: "The documentary succeeds with its tenderness, while vividly reminding us how easily society can forget its elders.

In March 2023, it was announced that Netflix had ordered a television series adaptation of the film with Michael Schur executive producing and starring Ted Danson.