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Two sisters, and a mystery, are the focus of today's 2014 Sundance Film Festival trailer.

"The Sleepwalker" begins with a couple, Kaia (Gitte Witt) and Andrew (Christopher Abbott), renovating a house in rural Massachusetts that belonged to Kaia's family. One night, Kaia's sister Christine (Stephanie Ellis) shows up in distress — and the next morning, in comes Christine's fiancĂ© Ira (Brady Corbet). Tension between the two couples grows, and then suddenly one of the four disappears.

The movie is directed by Norwegian filmmaker Mona Fastvold, who co-wrote with Corbet.

"The Sleepwalker" will screen in the U.S. Dramatic competition of the 2014 Sundance Film Festival. Its first screening is Monday, Jan. 20, at 2:45 p.m. at the Library Center Theatre in Park City.