Highlights 7/18 to 7/24

Poirot finds he cannot ignore the pleas of a young heiress when she approaches him with the bizarre claim that she may be a murderer on Masterpiece Mystery! at 8 p.m. Sunday.

Tukufu Zuberi sets out to find whether these metal “Duke Ellington Plates” printed the first copy of the Ellington hit, Take the A Train, on History Detectives at 8 p.m. Monday.

Episode two of Turmoil and Triumph: The George Shultz Years at 9 p.m. Monday, Shultz works to set up a summit meeting with the new Soviet leader, Mikhail Gorbachev.

Faces of America episode three at 10 p.m. Monday tells the story of how land came to define the settling and identity of America.

Nova at 7 p.m. Tuesday joins the search for the wreck of the Brittanic, the Titanic’s sister ship.

Alan Alda sets out to explore the difference between chimps and humans, and quickly finds that the scientists studying chimps and other non-human primates are themselves separated into opposing worldviews on Human Spark at 8 p.m. Tuesday.

Past and present collide as award-winning filmmaker Natalia Almada (“Al Otro Lado”) brings to life audio recordings she inherited from her grandmother, daughter of Plutarco Elias Calles, a revolutionary general who became Mexico’s president in 1924 on POV at 9 p.m. Tuesday.

Tavis Smiley and Jonathan Demme Collaborate on Tavis Smiley Reports: Been in the Storm Too Long at 7 p.m. Wednesday. This documentary captures the mood and spirit of New Orleans residents five years after Hurricane Katrina.

American Masters at 8 p.m. Wednesday follows musician Merle Haggard for two years, on tour and at home on his ranch.

Singer/songwriter Aimee Mann debuts on Austin City Limits at 10 p.m. Wednesday and 9 p.m. Friday. Folk rockers Iron & Wine, showcasing their acclaimed songs.

Journalist and author Carl Hiaasen discusses his career on Texas Monthly Talks at 7 p.m. Thursday and 8:30 p.m. Friday.

In Context Presents: Changing Lives Through Art at 8p.m. Thursday looks at two community arts projects: The Changing Lives Youth Theatre Ensemble and The Cipher: Austin’s Hip Hop Project. Both projects work to engage youth and the community in social change.

Legendary New Orleans songwriter Allen Toussaint hits the Austin City Limits stage at 7 p.m. Saturday with songs from his LP, The Bright Mississippi, and classic hits like “Southern Nights.”