Titled, "Tadonto", the movie will be directed by Bollywood art director-turned-filmmaker Nitish Roy.
"The movie is based on the life of Miss Shefali who kept to her profession surviving through exploitation and betrayal of a society in which women play secondary role. It is true in every age," Rituparna told PTI on the film's set.
The 43-year-old prolific actress said Miss Shefali's life should be properly explored in detail in a documentary film, bringing out the full story of her life, warts and all.
"My fictional character in the film comes in contact with two men and the script brings out her sorrow, betrayal, happy memories, torture - everything," Rituparna said.
"It talks about the exploitation of women from Shefali to a modern girl."
Rituparna is ecstatic about sharing screen space with the formidable troika of the stage, Goutam Halder, the bar pimp, Deb Shankar Halder, who plays a police investigator that frequents the place, and Kaushik Sen.
Asked if she was more comfortable with ensemble cast films packed with powerful actors, Rituparna said, "Ensemble or not, what matters to me is if I am the pivotal character in the film. You have to choose your role - ensemble or not - that is most important."
Roy said the protagonist embodied the suffering of a woman in the patriarchal system of society.
"It can't be the tale of a singular bar singer of a particular time though I have referred to the 70s-80s. Such characters exist in every age, every city and every society," Roy said.