But I just saw a video the previous night in an Youtube channel which tells about all the latest happenings in CN. There was this video which tells that it's Durdhara's letter which will prove Nandini's innocence.
Though nothing was said about how Chandra will believe that he hadn't read the original letter and how he gets hold of the actual letter.But they said that Apama has burnt the fake letter which she wrote in her overconfidence.By some circumstances Chandra gets to read the original letter again in which Nandini' name is not mentioned.However things takes a sharp turn when he reads the letter further and comes across a sentence like"Nandini's life is in danger" and he gets shocked that why would Durdhara try to save Nandini if she pointed out her as the murderer during her last moments? That would give him food for thoughts and sets out for investigation.I highly feel the possibility of such a revelation because when he read the fake letter for confirmation, he immediately stopped reading further when he came across the word "sautan Nandini". I think even CK did the same error when he read the letter aloud to Chandra on the day Durdhara died.I am sorry if it turned out false because I have no idea how far are the channel contents reliable.