A long time ago there was a black plague that struck the Earth. It forced anyone who had it to die an excruciating death but not all who died stayed dead. You have no idea what they have become but you know something unnatural is hovering close, watching you. You need to find shelter as soon as you can. You need to obtain the necessities such as food and a fresh water supply and probably a weapon. Bunker down and prepare yourself for any confrontation.The hardest part is that you have no idea when to expect it or what to expect at all.