‘Unforgotten’ returns for Season 3 with a new drama-filled mystery

A third season of investigations and emotional roller coasters in “Unforgotten” airs Sundays at 9 p.m., April 7 – May 12 on Arizona PBS.

Set in the southern part of England, this season’s case involves a missing 16-year-old girl whose body is found near a London motorway. The police investigation failed, and detectives Cassie Stuart and Sunil “Sunny” Khan are determined to find the truth.

Nicola Walker and Sanjeev Bhaskar reprise their respective roles as detectives Stuart and Khan. The pair are joined this season by four close-knit school friends who hold the key to what happened to the teenager: doctor Tim Finch, television host James Hollis, failing salesman Pete Carr and artist Chris Lowe. As the four suspects find themselves under the spotlight, their tight bond is put to the test. They all have secrets in their past and events that pulled their lives apart. None of them are quite who they first seem, but is someone capable of murder?

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American Masters highlights the photogenic storytelling of Garry Winogrand

Discover the life and work of Garry Winogrand, the epic storyteller in pictures who harnessed the serendipity of the streets to capture America during meteoric, oft-turbulent change in a new American Masters biography Sunday, April 21, at 2 p.m. on Arizona PBS.

'Breakthrough' unravels the history of our world's transcendent ideas

Take a mind-blowing journey through human history using six iconic objects that we often take for granted in "Breakthrough: The Ideas That Changed the World" each Wednesday at 9:30 p.m. on Arizona PBS.

Explore the complicated history of African-American entrepreneurship in America

The history of business and entrepreneurship lies at the heart of the American story, but often absent from that narrative are the experiences of African Americans. "Boss: The Black Experience in Business" tells some of those forgotten stories and trends Tuesday, April 23, at 7 p.m. on Arizona PBS.