A family, still grappling with the tragic accidental loss of one of their daughters, comes back home earlier than planned from a month-long vacation. They find Rebecca, their seemingly friendly house sitter, still at the house. With her plans disrupted by their early return, the family offers her a place to stay. Initially, Rebecca seems like a blessing, taking care of cooking, cleaning, and laundry. However, it doesn’t take long for the family to realize that she is not as harmless or stable as she first seemed.