Tuning in: On TV this week.

Saturday Feb. 12

Lackawanna Blues (HBO, 8-10 p.m.): The inspiring true story of Rachel "Nanny" Crosby, who owned a boarding house and helped heal the brokenhearted of her community. She fosters a little child whose own parents are unable to care for him, and raises him to eschew hate and to see others with compassionate understanding. Mature themes and situations, as well as some strong language.

Unstoppable: A Conversation with Melvin Van Peebles, Gordon Parks, and Ossie Davis (Black Starz, 8 - 9:05 p.m.): These men are legends in their own time, and their careers have broken down racial barriers while expanding artistic horizons for generations to come. This exceptional documentary gives us an inside look at the workings of Hollywood from the perspective of African-American actors, directors, and writers - all of whose lives were influenced by the three pioneers featured.

Law & Order: Criminal Intent (NBC, 9-10 p.m.): Muslim Americans arrested and held without charge under the Patriot Act are the focus of this well-written episode. A guard in a federal prison in Brooklyn is murdered when his colleagues believe that he will expose their torture of the detainees. Vincent D'Onofrio's skilled delivery stirs patriotic as well as moral sensibilities. Chris Noth is a guest star.

Saving the National Treasures (PBS, check local listings): Nova investigates the preservation of the nation's most prized documents: the Declaration of Independence, the Constitution, and the Bill of Rights. Time has flaked the ink and improper storage has overexposed the parchment on which US history is inscribed.