Shasanka is a retired teacher who lives with his wife and two daughters. The family is thrown into an uproar after he goes out for a walk and disappears from their lives. Each member of the family reviews her final hours and days with him to try and discover what, if anything led to his disappearance.
Unfortunately the movie Suddenly, One Day is not yet available on HBO Max.
| Directing | Mrinal Sen | Director |
| Writing | Mrinal Sen | Writer |
| Writing | Ramapada Chowdhury | Story |
| Writing | Shashi Anand | Dialogue |
| Directing | Siddhartha Dutta | Assistant Director |
| Directing | Rahul Bose | Assistant Director |
| Directing | Rashid Iqbal | Assistant Director |
| Art | Alok Upadhyay | Assistant Director of Photography |
| Art | Sunirmal Mazumdar | Assistant Director of Photography |
| Art | Subrata Debnath | Assistant Art Director |
| Art | Ashok Nag | Assistant Art Director |
| Art | Debashish Ghosh | Assistant Art Director |
| Editing | Rathin Bose | Assistant Editor |
| Art | Biswanath Das | Assistant Production Design |
| Art | Chakradhar Mahapatra | Assistant Production Design |
| Costume & Make-Up | Hara Das | Assistant Makeup Artist |
| Costume & Make-Up | Manu Dutta | Costume Designer |
| Costume & Make-Up | Pulin Kayal | Costume Designer |
| Production | Jitesh Basu Thakur | Production Manager |
| Camera | Subhash Nandy | Still Photographer |
| Crew | Mukul Chaudhuri | Production Controller |
| Costume & Make-Up | Debi Haldar | Makeup Artist |
| Costume & Make-Up | Ram Prasad Kahar | Makeup Artist |
| Art | Goutam Basu | Art Direction |
| Sound | Jyotishka Dasgupta | Music |
| Sound | B K Chaturvedi | Sound Recordist |
| Editing | Mrinmoy Chakraborty | Editor |
| Camera | K.K. Mahajan | Director of Photography |
| Production | Ravi Malik | Producer |
| Production | Debasis Majumdar | Producer |
| Sound | Anup Mukhyopadhyay | Sound Designer |
