Sehar is a crime drama. The movie follows the story of SSP Ajay Kumar (Arshad Warsi). At a young age, Ajay was traumatized by the death of his father, who was an army officer. When he gets appointed as the SSP of Lucknow, he vows to eradicate the crime from Uttar Pradesh. Things take a turn when he finds himself against Gajraj Singh (Sushant Singh), a ruthless killer and criminal boss in Uttar Pradesh. The fight against Gajraj Singh surely won’t be easy. Ajay engineers a Special Task Force to deal with Gajraj Singh. Will he finally succeed in catching the most dreaded criminal of all time and bring an end to his terror?