An 83-year-old man is enlisted to become a private investigator to go undercover at a Chilean nursing home to check on mistreatment but gets involved with the residents instead. Maite Alberdi’s documentary “The Mole Agent,” making its debut on “POV” (PBS, 9:30 p.m., check local listings).
The four part series from the UK, “The Salisbury Poisoning” (AMC, 10 p.m.) reenacts the crisis in the English city when an assassination attempt on a Russian spy exposed the town to a deadly chemical agent. Anne-Marie Duff, Rafe Spall and Annabel Scholey star.
In the new six-episode French series “Reunions” (Acorn TV, streaming), two half brothers meet each other for the first time when they learn they have to share their inheritance — a hotel on an island in the Indian Ocean. Loop-Denis Elion and Nicholas Brideet star.
A second season starts in the drama “Snowpiercer” (TNT, 9 p.m.) with Daveed Diggs, Sean Bean and Jennifer Connelly returning to their roles.
“The Bachelor” (ABC, 8 p.m.) sometimes seems to be a scheme to drive some women crazy (Sarah) — and reward the craziest (Victoria).
Spencer and Billy fail to get the welcome they expect on “All American” (CW, 8 p.m.).