In Game Designers' Workshop's own words - Where the Martian canals are no longer functional or where they were never created in ancient times, transportation needs have been taken over by vast caravans. Large wagons pulled by halfwild Martian beasts and protected by nefarious mercenaries carry items for trade between cities otherwise isolated from one another. Join a caravan expedition bound for Alclyon, a caravan beset by bad omens and subtle sabotage. Someone is willing to go to great lengths to see that the caravan does not reach its destination.