Agathe Cléry is a hard working and modern marketing manager from a cosmetics company, specialized in clear skin. Her colleagues find her snob, strict, and they know she's a racist. One day though, Agathe is diagnosed to suffer from Addison syndrome, which alters and darkens your skin color. One morning, she wakes up as black as the ones she intensively hated.

A team of several researchers travel to the Swiss Alps to investigate a scientific discovery on human evolution. The trip, however, turns into a deadly fight for survival when the team crash into a gully and find themselves falling prey to someone...or something.