Friends in Need

From publisher blurb: The PCs come across a scientist stranded in the middle of the Nevada Desert, with a pack he claims holds a cure for the Calera virus. His hair is falling out, and his truck is shot to hell. He needs to get to the Hoover Dam to finish his work - can the PCs help him? But who are the people following him? And what has he got to hide? A one-shot scenario for 1-6 players and estimated to take 4-6 hours.