A businessman dies. His wife's behavior is strange. Lorenzo invents a microphone and they manage to listen to conversations, which helps them connect the dots.

Deputy Commissioner Serrano is involved in a "mafia" of commissioners. Franco witnesses an assault on the deputy commissioner that ends with a gunshot wound that leaves him as the main suspect.

Franco is offered the position of deputy commissioner, which he accepts. At the same time, Lorenzo receives a scholarship in a program for brilliant minds that is being developed in France. Both will have to consider and deal with big changes, which could separate them.