In a dystopian future in the United States, a new justice system has been implemented to reduce prison overcrowding. Criminals are imprisoned in a vertical prison called "The Tower", where each level has a cell with two beds and a hole in the center of the floor that connects all the levels.
Each day, food is delivered to a platform that runs down the Tower. However, the quantity and quality of food varies by level, with the highest level receiving the best food, while the lowest level barely receives enough to survive. The story follows two inmates, one from the upper levels and one from the lower level, who come together to try to change the unfair system and escape the Tower. As the levels drop, they are met with despair, violence and madness, and discover that the only way to escape is to work together.
