I will summarize what I propose in this book, which is actually quite simple. Necros (Antiquity), false death or fictitious death (Middle Ages), imperfect death (Encyclopedia), clinical death or relative death in the 20th century, show two things. The first is that we can be wrong about the appearances of death. The second is that this apparent death is alive and not dead, because there is no life of the dead in the empirical sense of the term, although death may or may not be dead in the metaphysical sense. However, what complicates and obscures everything is the ancestral confusion about these survivors under the guise of death, of this kind of fourth state of life (a kind of natural anesthesia, so to speak) with a life of the dead, that is, the idea that there is a "death state" as well as a life state (or rather three life states: waking, sleeping, and deep sleep). And that this state of death, which the Greeks called Necros, medieval superstitions ghosts, reborn, is intermediate between life and the complete and total denial of life that is Thanatos for the Greeks or, for Christians and religions in generally, the resurrection or the afterlife. I have tried to capture in this work the positive in relation to death in apparently negative, ideologically false or irrational analyses. Jean Fallot