After the much controversial trailer release of The Accidental Prime Minister, another film is all set to raise a storm in political circles ahead of Lok Sabha polls this year.

The film is about the mysterious circumstances under which the second Prime Minister Lal Bahadur Shastri died in Russia. Titled The Tashkent Files, the film is directed by Vivek Agnihotri.

Agnihotri said he made this film after many people including top political leaders like Atal Bihari Vajpayee and George Fernandes had expressed the need for dealing with the mystery behind Shastri's death.

"On January 10, 1966, Shastri had signed the Tashkent Agreement... and hours later he died. A death mystery unsolved till date. Was it a heart attack or poison? The truth of the biggest coverup has been denied to his family and us," the director told PTI.

Immediately after his death, the family members of Shastri officially requested a post-mortem to the then acting Prime Minister Gulzarilal Nanda, but to no avail, Agnihotri said.

"The family also had requested former Prime Ministers Indira Gandhi and Rajiv Gandhi, but was not heeded to once again," he added.

Agnihotri also said it is strange that India, the biggest democracy in the world, has no information and document to uncover the mystery behind Shastri's death.

"This issue has been raised in Parliament for the last 50 years and yet, we are trying to find out the truth. I picked up the gauntlet and tried finding the truth, and hence I filed RTIs, but I was shattered.

"The RTI said there is no information. Our beloved second prime minister dies and the biggest democracy in the world does not have any information and documents," he said.

Agnihotri, however, hoped the film might have an answer.

He believes the film will change the narrative about Indian politics. The film stars veteran actors Naseeruddin Shah and Mithun Chakraborty in pivotal roles.

Agnihotri is planning to release "The Tashkent Files" in last week on February or March.