El hermano pequeño

Leo Minués, who used to be a classmate of Carvalho, is found dead the same day he had to testify in a case of corruption and someone asks Carvalho to investigate it. He accepts the case and finds out that Leo was collecting illegal funds for his political party. From that moment, a number of signs appear. This allows Carvalho to discover that Mínguez had made a list of the people involved in the case of corruption. Some videotapes appear, which makes things even more complicated, and Carvalho finds himself walking on shifting land, surrounded by celebrities in the highest spheres. Why did Mínguez die? Who has got the list?