The Dead Inside follows two paranormal detectives in 1940's Victoria, Canada as they are hired to investigate disappearances in a 19th century estate. After experiencing strange hallucinations that closely resemble their real memories from the Second World War, they assemble a team of experts to unravel the secret behind the phenomena. As the house slowly exerts its influence over the team they realize that the malevolent force is attempting to destroy them one by one, besieging the researchers with doppelgangers of past occupants and others the house has consumed. Desperately attempting to find a way to defeat the parasitic entities within the house, they uncover a mystery involving the interdimensional experiments of a former tenant, and that within the dwelling the line between the dream world and the real world has vanished...