A new company, Sindicate Corp, has created the largest tower built since the apocalypse. It is a magnificent building, housing several specialists, physicians and financial assistants. Sindicate hopes to make this inhospitable world into a more caring so that humankind can start to pick itself up on its feet. There is one problem: An experimental drug that was supposed help create radiation immunity has turned several people into zombies. These zombies are now swarming the tower, and you have to help. Take out the zombies...all of them.