Invisible Justice

David is a retired special forces soldier who returns home to his wife and son who he has never seen. After a few months at home he and his wives world is turned upside down when there son is shot and killed during a robbery . After he turned to the bottle and almost losing his job David accidently is taken by people from another planet.This planet is much the same as his own except for the oxygen. If you are in this atmosphere for a certain amount of time you will become invisible. David has stayed this length of time. After making a couple of friends David is going to be returned to earth as soon as a window becomes available. Everyone on earth that knows David thinks he is dead .Before he lets his wife know that he is alive. he decides to take care of a few things including his sons killer.