Mefruh: Violence Cin is about the experiences of a team investigating paranormal events. A team starting a new media channel starts making videos about paranormal events. The team decides to go to Yorgolar village, the old Greek village where a series of paranormal events took place in 1977 for their new video. The team, who set out without wasting time, find themselves in extraordinary paranormal events when they reach the village.

Businessman Evren throws a New Year's party inside a vault with his wife and invites his friends to show off. Things do not go as planned when the vault's door suddenly closes, trapping the guests in the soundproof area. Problems begin for guests who stay in the same room for days.

Esra and Orhan live together in Istanbul. After her mother's death, Esra married her father and was raised by her paternal grandmother. When his grandmother passed away, he came to Istanbul and did not return to his village for many years. Esra returns to her village with Orhan with the news of her father's death.