Difficult to loosen teeth when reading this book that explains with disconcerting coldness life Rudolf Hoes and careful construction of the crematoria. The paradox lies in the next "exciting" book which literally eats when he says things unimaginable, inconceivable. If he has not the force of 'if it is a man "Primo Levi, he describes with meticulous unsustainable and a sense of impressive detail how humans (" totally dehumanized ") have been behaving well! A great lesson of both history and literature.