The universe is a single apartment space, fifty feet in length and thirty feet across, an impenetrable entity known as Apartment Zero… For years the man known only as Tenant has lived out his dreary life within the walls of his apartment, never able to leave for fear of what might happen. Tenant has been taught by a computer – his only friend and source of knowledge – that nothing exists beyond the walls of his living area, and that if he were to attempt to leave he would certainly perish. But one day everything changes. An advertisement for a coffee company mysteriously appears in Tenant’s kitchen, and the ad displays a shocking image upon its paper Other people. Does this mean that Tenant is not alone and that there is life outside the apartment, after all? Summoning all his courage, Tenant dares to open the door to his apartment for the very first time, to see what lies beyond it…