Paappi Devataa is about Ram Kumar Singha, an unemployed guy, arrives in Bombay and loses his luggage. During that plight, a benevolent taxi driver, Rahim, comforts him in his driver's colony, and they befriend him. Rahim earns much respect in that area and loves his neighbor, Rosy. After a while, as a bowl over, Ram is a CBI officer appointed to solve a murder case of MLA Niranjan Das made by a truck driver. Due to concerns, Rahim places his mother and sister Reshma separately, and Ram falls for his Reshma unbeknownst. Stunningly, Ram discovers Rahim to be the convict and learns he works for Don Ratan Seth. However, Ram stands firm, and Rahim surrenders when he seeks the underlying cause, then Rahim rearward. He used to work as a truck driver in a transport company owned by Niranjan Das and Ratan Seth and finds out those underworld activities are carried out in its garb. So, Rahim questioned Ratan Seth, and in tandem, a dispute arose between the partners as Ratan Seth defrauded the company. Exploiting it, Ratan Seth intrigues Rahim by infuriating him against Niranjan Das and incriminates him for his killing. Now, Ram ensures Rahim and, with his support, seizes the empire of Ratan Seth. At that point, incensed Ratan Seth seeks to kill Rahim when his mother dies. Thus, Rahim onslaughts and ceases Ratan Seth. At last, Ram acquits Rahim as an approver. Finally, the movie ends on a happy note with the marriages of Ram to Reshma and Rahim to Rosy.