An uncommon movie

Within first five minutes this film setting tone, I think it will be like like another film that a young mom and her growing baby are kidnaped in a bucker, but you'll find that you have no idea to expect what's going on next. It creates an intense and nervous atmosphere.
Michelle escapes from bucker finally, but two man dead because of distrust. What will happen after heading Houston?
In conclusion, it's not a regular Hollywood movie.