Watch LUZ for Free: How to Stream the Movie Online at 123Movies. . Ruben and Carlos become cellmates in a minimum-security prison. While Ruben struggles to learn the ropes of daily life and where he falls in the complex hierarchical prison system, Carlos becomes a mentor and then eventually a lover. The two men develop feelings for one another they can't easily express. As time moves on and one of them is released before the other, there are questions looming as to whether what they had was real or simply out of the need for human connection.