A mysterious phenomenon strikes humanity and unexplained mutations gradually transform parts of the population into human-animal hybrids. The creatures, considered a threat, are sent to specialised centres in an attempt to control their apparent violent tendencies. When a convoy crashes in a forest, paranoia spreads in the local community as the surviving creatures scatter into the wild. François and his son Emile embark on a desperate search for his missing wife Lena who disappeared after the crash.