In the late 19th century, a brutal land baron slaughters a Roma clan, unleashing a curse on his family and village. In the days that follow, the townspeople are plagued by nightmares, the baron's son goes missing, and a boy is found murdered. The locals suspect a wild animal, but a visiting pathologist warns of a more sinister presence lurking in the woods.

Clem follows the life of a young teenager, Clémentine, who becomes a mother at the age of sixteen, at the centre of tensions between her parents and Julien, the father of her child Valentin. It deals with the problems of teenage life and that of a mother with a strong personality.