The Beast Inside is a photorealistic horror adventure with a first-person view. The game will tell the story of two characters living in two different eras. Adam, a CIA cryptanalyst, leaves Boston and moves to the provinces with his wife Emma to work in silence to decipher the code and try to change the course of the Cold War. One day, in the attic, Adam finds Nikolai's hidden diary, which brings the nightmares of the past straight into the present and puts the lives of Adam and Emma in great danger. You have to fight for your life, using both firearms and elements of the environment.