You're alone in the wasteland. Your family, friends and loved ones are going to die of dehydration in three month - unless you find the controller chip for water purification system in the Vault you came from. Here, in the radioactive desert, full of nothing but stumps, bones, rusty wreckage and bloodthirsty savages, you seek for a rare piece of high technology. You WANT to believe it is there, because if it's not - you're done. You have never left the Vault before. You have never seen the sky. You have no idea where to go.