Adelaide Wilson (Lupita Nyong'o) is a woman returning to her beachside childhood home with her husband, Gabe (Winston Duke), and their two children (Shahadi Wright Joseph, Evan Alex) for an idyllic summer getaway.

Haunted by an unexplainable and unresolved trauma from her past and compounded by a string of eerie coincidences, Adelaide feels her paranoia elevate to high-alert as she grows increasingly certain that something bad is going to befall her family.

After spending a tense beach day with their friends, the Tylers (Elisabeth Moss, Tim Heidecker, Cali Sheldon, Noelle Sheldon), Adelaide and her family return to their vacation home. When darkness falls, the Wilsons discover the silhouette of four figures holding hands as they stand in the driveway. Us pits an endearing American family against a terrifying and uncanny opponent: doppelgängers of themselves.