"The unknown's very long eyelashes cast a small shadow on his cheeks with the confused outline. Nothing resembling the nervous and immobile appearance of police officer Adamsberg. Clearly, the unknown was not trying to please. However, he had the devil's marks in his hair, and everyone knows that the devil can easily take the form of a charmer."

Like a drop of truth falling exactly in the right place, crucially changing all the data, the reader watches in shock a world constantly changing before his eyes, from the 1800s to the present day, in which a couple of maniacal murderers act. He kills descendants of vampires and she kills anyone who threatens her career.

"Fred Vargas, number one in French crime fiction, presents a book-river, the plot of which unfolds on three levels, more complex than any of her previous works, but always in a particularly enjoyable way."
("Le Nouvel Observateur")