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Echelon is set on a fictional 'tenth planet', which is under research in the setting of this game because it is home to relics of a long-dead alien civilization. Your mission is to investigate the disappearance of a scientist. You arrive, set out to examine the evidence, then the plot thickens.
This game is not for the casual. It is involved, thinky, tricky, and has several sub-plots and puzzles. It is also very hard to get a feel for and work through without the original manual, and I do not know offhand if there is a pdf or other way to reprint it. If you've played it before and like nostalgia, go ahead. If not, be warned.