Yann Lazarrec seems to be a normal man.
He's a pharmacist who soothes mankind with his potions and fights to protect the earth against the polluters who abuse it.
Lazarrec is full of good intentions but we know that the road to hell is also paved with them. It is precisely there, in hell, that the pharmacist spends most of his time. He has quite simply gone mad.
In the shadows of his laboratory, he secretly mixes poisons to kill the polluters. Unbeknown to all, the ecological dreamer, the dedicated pharmacist has become a serial killer.
By a strange irony of fate, François Barrier, the cop in charge of the murder investigation, is also an ecologist. You know, the normal kind who goes out peacefully protesting and demonstrating.
A conference about the protection of the environment brings the two men together. They immediately hit it off.
Lazarrec and François beome joined like brothers in a common cause. Little do they know that they'll become brother enemies.