Shyam, a film director, is intrigued by Iravati, a Kathak dancer, and intends to cast her in his next film. But her brother Kumar, a failed actor, is adamant about keeping Shyam away from Iravati. Instead of it being an act of jealousy, Kumar harbours a deep dark secret. Set against the 1950s era, 'Dhappa' is submerged in mystique and drama.