In the final days of mankind, the last nine human beings left in existence are holed up together in a sanctuary base dubbed Plan Z. First Citizen, Phoenix Nichols, bears the task of keeping morale alive, despite his increasing apathy and decreasing sanity. Tensions have always been present but recent tragic events have set in motion the rapid decline of their tiny society, as a series of disturbing crimes and secrets come to light. With the darker side of humanity becoming ever more apparent, its last representatives begin to question whether survival is possible or even desirable.