The Beast Inside is a psychological horror game that weaves together two timelines, following a CIA cryptanalyst in 1979 and his ancestor during the American Civil War, whose stories become entangled through a mysterious diary found in an isolated house.

Exploration and puzzle-solving drive the narrative forward, while a growing sense of dread builds as both eras' secrets surface. The dual storylines and unsettling atmosphere deliver a slow-building, story-heavy horror experience.