![Secrets of the Celtic Grave](https://image.tmdb.org/t/p/w185/zltSKIXm5729alG4dnbcgvQbLki.jpg)
When a daughter becomes concerned about her mother’s well-being in a retirement home, private investigator Romulo hires Sergio, an 83-year-old man who becomes a new resident—and a mole inside the home, who struggles to balance his assignment with becoming increasingly involved in the lives of several residents.