Translated from the back of the book:
While the "scalpel killer" is murdering in the capital, at a street corner, at the exit of a subway, waking from a night of debauchery in the stairs of a building, you are assaulted by hooded men.
Abducted, beaten to death, mutilated, you're thrown into a hole, which happens to be a gigantic underground human bodies dump. The pile of corpses actually saves your life from an otherwise fatal fall.
Your realize that you're not alone in the underground and you're reprieved. You will have to run, hide and fight if you do not want this labyrinth of tunnels to become your grave...