A graphical text adventure game, by the same authors as Holocauste (also from MBC informatique).
The back of the box says (translated from French):
"Earth, 2020. Something very bad is happening: most of the population dies, with no apparent cause. Nations are unable to deal with this plague.
A renowned scientist establishes that whatever is killing the population comes from a previously unknown planet.
He asks his friend DAN SILVER to help him solve the mystery, but dies before meeting him.
You are DAN SILVER.
The fate of humanity, or what's left of it, is in your hands."