A killer is spreading panic in Paris. His weapon of preference: a screwdriver that he stabs into the ears and eyes of his victims. His distinctive sign: the messages he leaves on the bodies, written on Post-its, addressed to the police. It’s a macabre version of the exquisite corpse game.
Head of the Research and Response Unit for Serial Murders, Chief Coblenz is a specialist in psychopaths. He is also a bon vivant in love with a green-eyed dancer, and nothing can spoil his appetite for life. But something is wrong. It’s impossible to construct a profile of the assassin or his prey.
Only one thing is certain : this whack job has only just started his murderous rampage. And so, a race against the clock begins. But how do you find a needle in a haystack? How can you anticipate the actions of a man when you don’t understand his acts ? It’s the biggest challenge of their career, and they must act before the River Seine turns blood red.

The victim is almost seated, back against the plaster tagged wall.
A Post-it is stuck to the collar of her jacket. On it is written, «My love.»