Bhool Bhulaiyaa 3 follows Ruhaan, a fake exorcist who is called to a royal palace in West Bengal. He uncovers a dark past involving a haunting spirit, believed to be Manjulika, who seeks revenge. Ruhaan discovers that the true ghost is the reincarnated prince, Debendranath, not Manjulika. The film mixes horror and comedy, with Kartik Aaryan playing the lead role. The story revolves around reincarnation, redemption, and the mystery of the past.