I'm not sure whether this question fits here or not. I was watching the movie 'Talaash: The Answer Lies Within', 2012 movie directed by Reema Kagti.
In the movie, many police officers addressed a case as "A-final case". From what I understood I think they either meant a case which never got solved or a case which involved high profile people.
I looked for the term on google but didn't find anything remotely close to it. I guess it's just an alias or a pseudonym for some another term. Please help me in finding the meaning of this term.