Choices... to choose between right or wrong is simple, but what defines one's life is the decision between the greater of two goods or the lesser of two evils. This is the advice that Zooni Ali Beg (Kajol) receives from her father just as she is about to venture out into the world on her own for the very first time. Little does she know that these very words will shape her life.

Zooni Ali Beg (Kajol) is a beautiful girl who is full of spirit. She is blind but wants to discover life for herself and isn't going to let her handicap stop her. She is leaving home on her own for the first time and wants to make the most of it. During this trip she discovers Rehan, who seems to understand her better than anyone has before. It is so refreshing for her to find someone who sees past her blindness and looks into her soul. She knows she will cherish every moment that she has spent with him. But to her disbelief she discovers unfathomable things about Rehan which will change her life forever. She now has to make the hardest choice of her life.

Rehan Qadri (Aamir Khan) is a local tour guide with a keen interest for poetry, which he uses to woo his women, always to success. He is a happy-go-lucky guy who believes in enjoying life to the fullest, and not getting tied down to any place or anybody. And then he meets Zooni. Zooni, who makes him feel things he has never felt before. She touches the true Rehan, and that is the problem. He knows he cannot let Zooni know the whole truth about himself. What he fears the most is that her being a part of his life can destroy her.

Zooni meets Rehan, who goes from city to city exploring their architecture as also the women. Her friends warn her against this good-for-nothing roadside Romeo, but she chooses to ignore them. She is not one to be protected. It is now her time to discover life, and love. Is this really the right choice?

Rehan is fascinated by Zooni. He truly wants her to see life as it should be seen, in its many colours - and as he promises her, the time spent with him will be the most precious in all her life. Zooni sees Delhi, life and love like she never has before, because of Rehan.

What Zooni doesn't know is that Rehan has another side of his life that he has kept from her - something that can not only change her life, but can also destroy it.

Fanaa...  destroyed in love...