When Evil Comes

There is a cabinet in the basement of the house, and on it a warning that says Do Not Film. Inside is a puppet, sealed. Lina's family moves into the house, remote and quiet, and Lina knows more about what that warning means than the others do, because her line were exorcists. Her stepsister Chloe cares about her follower count. She opens the cabinet, takes the puppet out, and shoots a video with it, mimicking it, and posts it. The clip travels fast. That is when the curse starts working on her. Chloe's body begins to change shape wrongly, the joints setting, the skin going hard and doll-like, until what is left of her is closer to the thing in the cabinet than to a person. What it turns into wants blood, and it is inside the house with the rest of the family, who now have to deal with something Lina's grandparents were trained for and she was not.