In a sumptuous mansion hanging from a cliff, over the Mediterranean Sea, two corpses appear. They are husband and wife. They are seated at a splendid table, with an impeccable white tablecloth and napkins, complete with candelabras, the most delicate delicacies, wines and champagne. They had dressed to the nines for what had all the appearance of a romantic dinner. However, they had poisoned each other. Why not by common agreement or through the intervention of a third party? Well, because in both cases the most logical thing would have been to use a single poison for both. And there, two different and very difficult to obtain tosigos had been used, both one and the other. But this posed a difficulty: the temporal coincidence in the transition to the act. How, without prior agreement, did it occur to both of them to do the same thing, at the same moment? Inspector Páramo could only think of one clue: the phenomenon known as a red moon had occurred the night before.

   A flashback and a radical change of space intervene. We move to Buenos Aires where a young detective takes his first steps in criminal investigation under the tutelage of Inspector Esteban Mendoza, who, for the first time in his life, finds himself at a dead end because, with all his science and experience, he is not able to catch a serial killer who usually operates around the Retiro Station. This murderer seems to fly under everyone's radar. And there is another thing that particularly puzzles Mendoza. The victims are atrociously mutilated in places where many people should have heard their screams and did not.

   At the same time, another action takes place. A grandmother from the Plaza de Mayo is still investigating the whereabouts of her children, the parents of Donato, the grandson that the police allowed her to keep. Donato's partner becomes obsessed because she thinks she knows the identity of the Retiro murderer. According to her, it is her upstairs neighbor, Mario Aventino.

   Everything will conclude in the luxurious mansion from the beginning, now inhabited by another couple.

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