Two urban explorers break into a forgotten building in the English countryside, desperate to save their failing YouTube channel. Inside, they uncover the legacy of the Morbex Institute and its cruel ‘black bile’ experiments — a twisted attempt to open psychic gateways to the other side. The deeper they go, the more the building warps around them, driving them into paranoia, obsession, and psychological collapse. As the explorers try to escape, infection spreads and the walls close in, revealing something still lurks in the dark.