M. Night Shyamalan‘s new movie “Sundowning” stars Kathryn Hahn and rising child actor Ed Oxenbould, TheWrap has learned.

Hahn plays a single mother whose two young children visit their grandparents… and things go very wrong. Oxenbould plays her son, who is protective of his sister.

No other plot details were immediately available, as Shyamalan prefers to surprise his audience. However, “sundowning” is described as a psychological phenomenon associated with increased confusion and restlessness in patients with some form of dementia. Symptoms also include agitation and mood swings.

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Shyamalan is producing with Marc Bienstock and Ashwin Rajan, while Steven Schneider of Room 101 is executive producing. Production has nearly wrapped in Shyamalan’s home base of Pennsylvania.

“Sundowning” is a low-budget movie that marks Shyamalan’s return to the creepy genre fare that earned him legions of fans following big-budget detours “After Earth” and “The Last Airbender.”

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Hahn, who currently stars opposite Jason Bateman in “Bad Words,” recently earned rave reviews for her performance in the indie movie “Afternoon Delight.” Her recent credits include “The Secret Life of Walter Mitty” and the box office hit “We’re the Millers.” The actress, who will soon be seen in Brad Bird’s “Tomorrowland” and Shawn Levy‘s “This Is Where I Leave You,” is repped by the Gersh Agency, Brillstein Entertainment Partners and attorney James S. Adams.

Oxenbould plays the title character in Disney’s adaptation of the beloved children’s book “Alexander and the Terrible, Horrible, No Good, Very Bad Day,” which co-stars Steve Carell and Jennifer Garner. He’s repped by ICM Partners, Coast to Coast Talent Group and Industry Entertainment.