I recall a film where children (maybe brother/sister) were stuck in their country home. Unable to get out because small creatures would get them. To protect themselves they made a circle around the house.
The story might have started out with the young boy knowing there are creatures (maybe in the walls), but no one believes him. It could be that they just moved into the this house.
There might have been a magical book involved as well.
The film must have come out in the last 10 years or so.