Despu s de recibir una llamada de alarma, la polic a encuentra en un chal de una urbanizaci n madrile a a un hombre manchado de sangre y un cuchillo con sus huellas junto al cad ver de su mujer. Un a o m s tarde, un anciano se entrega a la polic a afirmando ser el secuestrador de tres personas desaparecidas: el abogado defensor de su hijo, la jueza que le conden y una joven estudiante que testific en su contra en el juicio. Convencido de que los tres fueron sobornados, el hombre asegura que morir n uno cada semana hasta que detengan al verdadero asesino de su nuera y su hijo sea liberado. La inspectora Indira Ramos, de una tica tan inquebrantable como su fobia a los microbios, solo tiene tres semanas para resolver el caso antes de que el buen padre lleve a cabo su macabro plan. ENGLISH DESCRIPTION After receiving an alarm call, the police found in a chalet in a Madrid urbanization a man stained with blood and a knife with his prints next to the corpse of his wife. A year later, an old man turns himself in to the police claiming to be the kidnapper of three missing persons: his son's defense attorney, the judge who convicted him, and a young student who testified against him at trial. Convinced that the three were bribed, the man assures that one will die every week until the real murderer of his daughter-in-law is arrested and his son is released. The inspector Indira Ramos, with an ethic as unbreakable as her phobia of microbes, only has three weeks to solve the case before the good father carries out his macabre plan.