The message is to we be alert all time, no matter how friendly the society is.
This is like an extended version of 'Prisoners'. Sets in a small snowy Canadian town where a ten year old girl was mysteriously disappeared and so the film focused on the life of her parents who are eager to see her even after 8 years past. The cops and parents, hopelessly look for any clue of her being alive. Happy or sad ending, that's what the film's conclusion decides. Maybe the director was inspired to make this by his previous film, which was similar and based on the real, but that ends differently.
