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Today's 2014 Sundance Film Festival trailer is a real-life mystery, with music as the thread that binds a people.

Filmmaker Sterlin Harjo starts his story with the disappearance of his grandfather in 1962, in Sasakwa, Okla. When he disappeared, the Seminole community searched for him, while members sang ancient songs in the hope that they would guide his return. Harjo's documentary looks into his grandfather's disappearance, and traces back the roots of those songs — which go back to the time of the "Trail of Tears," and is tied to traditions of Scotland, Appalachia and African-American slaves.

This is Harjo's third visit to Sundance, but his first with a documentary. He has premiered two dramas in Park City: "Four Sheets to the Wind" (SFF '07) and "Barking Water" (SFF '09).

"This May Be the Last Time" screens in the Documentary Premieres section of the 2014 Sundance Film Festival, and is noted as part of the Sundance Institute's Native American and Indigenous Program. The movie premieres Sunday, Jan. 19, at 2:30 p.m. at the Prospector Square Theatre in Park City.

— Sean P. Means