30 years ago, David's younger brother Simon disappeared without a trace and has never been seen since. David is still looking, and the search for Simon has become his life.30 years ago, David's younger brother Simon disappeared without a trace and has never been seen since. David is still looking, and the search for Simon has become his life.30 years ago, David's younger brother Simon disappeared without a trace and has never been seen since. David is still looking, and the search for Simon has become his life.