F.I.R. (2006) : 1x1272

Two people come with a complaint about their missing grandfather and father respectively. Grandfather has tattoo of numerical 1 and the father has numerical 2 on his hand. Chandramukhi visits a library where she finds a book on independence. She finds out that after independence 5 freedom-fighter had looted the train carrying Indian treasure and went missing. What will they do now?