Set in the stark quiet of rural America, Watch Your Sister follows the Johnson family, who have worked the same unforgiving land for generations. Childhood games between young Delbert and his little sister Charlotte take a darker turn the day she glimpses a figure lurking in the hidden room beneath the staircase — a moment that hints at the shadows threaded through their home.
 

After their father’s sudden death in a farming accident, the family clings to Charlotte as their source of light. Delbert, tasked with watching her every moment, feels the weight of responsibility pressing in on him, even as he adores her. But on Labor Day 1958, tragedy strikes when Charlotte falls from the back of a truck and dies instantly in Delbert’s arms. The loss shatters their mother, Mattie, whose grief twists into something raw and volatile.
 

As the family gathers for the wake inside the old farmhouse, the air thickens with sorrow, blame, and unspoken fear. The Johnsons’ world, already fragile, begins to fracture in ways no one can fully see — leaving behind a house steeped in grief, secrets, and a silence that feels anything but empty.