In the second episode of City of Shadows, Felix Torrens finds himself imprisoned in a basement, surrounded by a traditional Gaudi fence. Rebeca learns of the second victim only upon her arrival, her dismay evident as she chides Milo for withholding the information. She warns him against petty behavior, while he is distracted by his estranged wife, Irene's insistence on meeting up.

Mauricio, a TV reporter, is being ousted from his own channel. But with a tip on the second abduction, he manages to regain his footing. Singla continues to treat Milo as an outsider, keeping him in the dark about the next meeting. However, Milo arrives on time, accompanied by Susana and the anti-corruption prosecutor, Marius Fuster. While the MO seems similar, Fuster posits that Torrens is copying Pinto's killer as he's being investigated for fraud. Milo firmly rejects this theory, insisting that there's a vigilante organization targeting these wealthy and influential personalities.
Meanwhile, Mauricio receives another tip and becomes the first reporter to mention the serial killer theory. Rebeca and Milo run into each other at a library. She's delving into Freemasonry while he's checking out adolescent suicide books. They bicker, but this time there's no bite.
They pay a visit to the Torrens office, nestled in the enchanting Palau Guell, another marvelous creation by Gaudi's genius. Old footage reveals the transformation of the Palau Guell neighborhood from a vibrant cultural hub to a bustling corporate district.
During the press conference, Fuster delves into the angles of fraud and escape, but Mauricio's inquiry about the serial killer theory sends ripples of uncertainty through the room. In the basement, the killer confronts Torrens, who offers him a bribe. However, the killer merely hurls his money back at him, an act that echoes the disdain for corruption in the city's undercurrents.
Milo and Rebeca speculate that the culprits are a mix of vigilantes and victims, each one protesting against corporations and the government for their relentless pursuit of land, homes, and jobs. When they question Mrs. Torrens, she exudes an air of entitlement, refusing to cooperate and questioning Mauricio's theories with a disdainful gaze. Milo realizes that someone within the circle has tipped off Mauricio.
Mrs. Torrens also vents her frustration to Singla about Milo's "audacity," but this time, the sergeant is at a loss as Judge Susana stands by Milo's side. We also see Rebeca's mother's absence as she ignores a condolence call, instead watching an elderly woman with an untouched alcohol glass. Was her mother a lonely alcoholic?
Old footage flashes by, showing businessmen tearing down the neighborhood and erecting corporate glass buildings, reflecting the relentless drive for profit that has shaped the city's landscape.
Milo endeavors to visit his brother, Hugo, and his wife to collectively mourn the loss of Marc. However, Sara repels him, and a heavily intoxicated Hugo punches him, blaming Milo for Marc's demise. Milo also visits the Sagrada Familia, one of the "ugly" churches that the locals despise due to its expansion being fueled by the theft of their land.
Milo and Rebeca then meet with Eugeni, an expert in freemasonry. It turns out that the symbol "G" is a common freemason symbol with deep spiritual meaning. Torrens desired to join the inner circle but was rejected. Yet, Gaudi was not a freemason, and Eugeni claims the killer is attempting to distract them and/or tarnish the reputation of this artform by using the "G" signature.
In the basement, Torrens recognizes the Gaudi fence, and his reaction is recorded. A background check reveals that he was the black sheep of a political family. He regained his reputation by engaging in charity work and preserving the city's art and culture. Once he became part of the city's elite, he turned to embezzlement.
Irene finally convinces Milo to meet her. She is financially strapped and wants money but refuses to ask her wealthy father for it. She holds all the cards as she left the marriage, refusing to share her thoughts on Milo and asking him if he wants to reconcile. However, she refuses to divorce him as she doesn't want to prove her father right that their marriage was a mistake. In the end, she sleeps with Milo to persuade him to sell their old apartment.
At the precinct, Bruno, Milo's former partner, tells Rebeca that he can help her deal with Milo, leaving her confused. During therapy, Milo reveals that he was raised by his grandparents until he was 12 years old. Hugo hated him as he had to suffer their father's abuse alone. Later, Marc became closer to Milo than Hugo, which further angered Hugo.
In an interview, Mauricio targets Milo, claiming that such cops are not fit to protect them. Pope Benedict XVI is soon visiting Sagrada Familia, and the cops are running out of time as the church is Gaudi's last iconic piece and may be the site of the next murder.
At the end of the episode, we see the killer: a tall man with black hair and a beard, standing menacingly in the shadows.