Haunted by trauma from her past and compounded by a string of eerie coincidences, Adelaide grows increasingly certain that something bad is going to befall her family. After spending a tense beach day with their friends, 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. The endearing American family faces doppelgangers of themselves....