Banalaxmi and inherit Sen's wealth. In his room, Byomkesh notices a plastic flower, which triggers a new line of thinking in him. He quickly takes the photo of Sunayana and compares it with the four women's photos and goes for a detailed analysis. He calls everyone and finally reveals Dr. Das as the person behind the murder of Sen and Panu. Dr. Das earlier said that he was playing sitar in his room when the murder was happening. But this statement was disproven when Byomkesh found the tape that was playing in Dr. Das's room during the murder; the argument that he was in his room playing his sitar was Das's alibi. Byomkesh shows them the stolen jewellery and contract papers of 'Sunayana' which Das was hiding for a long time. Banalakshmi, the employee of this nursery, is revealed as the actress Sunayana and the wife of Dr Das. She declares that she underwent plastic surgery to change her face (which Byomkesh realized while contemplating the plastic flower). Finally Banalakshmi confesses that her husband exploited her beauty to make money and how he murdered Murari, Sen, and Panu to destroy all the evidences of his criminality. Cast Uttam Kumar as Byomkesh Bakshi Shailen Mukherjee as Ajit Kumar Banerjee (renamed Ajit Chakraborty) Sushil Majumder as Nishanath Sen Kalipada Chakraborty as Rasiklal De (debut) Jahar Ganguli as Ramen Mallick Subhendu Chatterjee as Bijoy, nephew of Nishanath Prasad Mukherjee as Nepal Gupta, a chemist and ex-professor Bankim Ghosh as Brajadas Nripati Chattopadhyay as Mushkil Mia Subrata Chatterjee as Nazar Bibi, Muskil Mia's wife Kanika Majumdar as Damayanti Shyamal Ghoshal as Dr. Bhujangadhar Das Asit Baran as Inspector Barat Chinmoy Ray as Panu Gopal, the mute victim Geetali Ray as Sunayana/Banalakshmi/Nrityakali Das Shekhar Chatterjee Rupak Majumdar Awards See also Feluda Sherlock Holmes Byomkesh Bakshi in other media References External links 1967 films Films directed by Satyajit Ray Bengali-language Indian films Indian detective films Films set in Kolkata Films featuring a Best Actor National Award-winning performance Films whose director won the Best Director National Film Award Films with screenplays by Satyajit Ray Byomkesh Bakshi films 1960s Bengali-language films Films based on works by Saradindu Bandopadhyay