Like so many other nights that she does not recall, a little girl wakes up in her dreams. She finds herself in a world of nightmare and a mysterious voice tells her to get up and to start walking. A camera is lying at her feet. Lumen is a platform-puzzle video game where the player assumes control of a girl trapped in a world of nightmare as she tries to make her escape. With the sole help of her camera, she will have to dodge traps, run away from her enemies and use her photographs to change the world that surrounds her.