Episode 1 - Professor Fontán

Franco is a minor officer who is unexpectedly confronted by Lorenzo, a half-brother with a high IQ. Lorenzo helps him investigate an apparent suicide case in which there is something more.

Episode 2 - The secret of Roque Peralta

Franco is overwhelmed in his first job with the homicide squad. Lorenzo suggests investigating the dead man since no one claimed his body.

Episode 3 - The case of the fat killer

The producer of a quiz show is murdered. Franco takes advantage of Lorenzo's erudition to enter the channel incognito.

Episode 4 - The lonely foreign

At a camp, Lorenzo learns about the legend of the lonely stranger. Lorenzo is excited and suggests that his companions investigate what happened.

Episode 5 - The only heir

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.

Episode 6 - The madman on the rooftop

A sniper kills three victims in different places. In the middle of the investigation, an inspector appears to assess how Lorenzo lived. Mansilla "hires" Marcelita to pretend to be Franco's girlfriend, thus covering up the mother's presence in the home.

Episode 7 - Death on scene

The Montero brothers went to see a play. During the play, the main character is murdered and the culprit appears to be one of his fellow actors.

Episode 8 - Difficult times

A businessman is found dead in a pile of sand in the middle of a construction site, with a bullet in his back. Meanwhile, Lorenzo suffers rejection from the other kids in the neighborhood.

Episode 9 - The group of four

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.

Episode 10 - Episode 10