This book is a cross between a horror and crime novel, with a touch of the gore genre. From his jail cell, a serial murderer remembers the murders he committed when he was young. Germán Goitia is a police inspector, the son of a woman who was sentenced to death for the murder of sixteen children. As revenge, he decides to kill the sixteen firstborn children of the sixteen people responsible for incriminating his mother. Throughout the whole novel we don?t know that he is the murderer, until he manages to devise a plan to save the boys and girls who are at risk: taking them to an isolated and unoccupied spa off season to ?protect? them from the murderer.