This is the story of India becoming a nuclear state which has been told fictionally. Now it is based on the first nuclear tests performed by India without being caught by CIA.
As everyone knows about the ending so the suspense was in telling. John Abrahamm and his team plan to test the nuclear bomb in pokhran while hiding from the satellites of America. As everyone was becoming powerful first America and then china.
So they successfully perform 6 nuclear tests .
Its really a great movie.