Highlights 7/17 to 7/23

Emmy Award-winning filmmaker Bob Landis shares a spectacularly dramatic and intimate record of the lives of the Druids, the most celebrated wolf pack in North America, in Yellowstone’s beautiful Lamar Valley on Nature: In the Valley of the Wolves at 7 p.m. Sunday.

What does an honest cop do when his bosses are on the side of the lawbreakers? Outwitting prosecutors, politicians, mobsters and run-of-the-mill kidnappers and killers, Detective Aurelio Zen (Rufus Sewell) brings justice to modern-day Italy, whether the authorities want it or not on Masterpiece Mystery! at 8 p.m. Sunday.

The History Detectives investigate a propeller from a World War II drone, a wooden club that could be Teddy Roosevelt’s, and a letter that Clara Barton could have written concerning a soldier’s life at 7 p.m. Tuesday.

Frontline at 8 p.m. Tuesday goes inside the U.S. military’s “kill/capture” operations to discover new evidence of the program’s impact — and its costs.

POV: Biblioburro, The Donkey Library at 9 p.m. Tuesday follows the story of a librarian — and a library — like no other. Colombian teacher Luis Soriano was inspired to spend his weekends bringing a modest collection of precious books, via two hard-working donkeys, to the children of a poor.

The creative minds behind the shows Mad Men, The Wire, and Treme discuss historical and modern day relevance in television dramas during On Story: Austin Film Festival at 10 p.m. Tuesday. At 10:30 p.m. On Story features the people behind the films Red Dawn, Born on the 4th of July and Apocalypse Now discussing war in film.

Secrets of the Dead: Lost in the Amazon at 7 p.m. Wednesday unravels the truth of what really happened to Colonel Percy Fawcett, an explorer who went looking for a city of gold in the Amazon in 1925 and disappeared in the jungles of Brazil forever.

In 1532 a tiny band of Spanish soldiers crushed the mighty Inca Empire, then the most powerful civilization in the Americas, Nova reveals the untold final chapter of the conquest on The Great Inca Rebellion at 8 p.m. Wednesday.

Secrets of the Dead: Aztec Massacre at 9 p.m. Wednesday paints a new picture of the violent relations between the Aztecs and the Conquistadors and rewrites much of what we thought we knew about the Aztec civilization.

Hard-rocking roots music storytellers Drive-By Truckers hit the Austin City Limits stage in support of their album Brighter Than Creation’s Dark, and dusty Texas troubadour Ryan Bingham follows with tunes from his latest record, Mescalito at 10 p.m. Wednesday and 9 p.m. Friday.

Join Overheard with Evan Smith at 7 p.m. Thursday and 8:30 p.m. Friday as he talks to Chely Wright about coming out as the first openly gay country music star and her new memoir Like Me.

See how to extend summer vegetables and get ready for fall crops on Central Texas Gardener at noon Saturday. On tour, visit East Side Cafe, where organic gardens inspire daily recipes.

Steve Earle pays tribute to his mentor, legendary Texas troubadour Townes Van Zandt and Kris Kristofferson follows with tunes from his latest album on Austin City Limits at 7 p.m. Saturday.