Episode 2 of Subteran kicks off with Cami awakening in the confines of Bone's fortified hideout, her mind haunted by a nightmarish revisitation of Luca's brutal demise. She pleads with Bone to release her, driven by an urgent desire to reunite with her son, but he stands firm, insisting that the best way to safeguard Matei's life is to maintain distance. As Bone prepares to depart, he reinforces his stance, his resolve unwavering that Cami's absence is Matei's safeguard. Cami's suspicions deepen when she realizes Bone is privy to her son's name, casting further doubt on his intentions.
Elsewhere, the police stumble upon Cami's incinerated vehicle, its charred interior revealing a corpse beyond identification. The vehicle is traced back to Cami, prompting Chief Detective Tatu to leap to conclusions, assuming the worst. However, Chief Prosecutor Golescu cautions patience, advocating for the case to be treated as a missing persons matter until forensic analysis confirms otherwise. As protocol dictates, the first port of call in such cases is the family.
Meanwhile, Tanase celebrates his birthday amidst a lingering unease, as Crisi fails to answer his calls. His concern mounts, prompting him to reach out to Dracu, who's just awakening from slumber beside Tili in their hotel room. Tanase tasks Dracu with oversight of the money collection, urging him to secure the two million levs essential for their impending deal with Lars, and to locate Crisi. Concurrently, Bone disposes of Crisi's SIM card by discarding it onto the tracks of a passing train before proceeding to his crew's abode.
At the crew's residence, Bone discovers his comrades engrossed in counting stacks of cash. He learns that Tanase is putting pressure on all distributors to contribute to the two million needed for a significant transaction. Bone interrogates further, but the lack of specific knowledge about the deal hinders his inquiries. Back at the safe house, Cami's desperation to escape leads her to a laptop, a fortunate discovery that she exploits to hack into its hidden files. There, she stumbles upon a treasure trove of photographs featuring her, Luca, and Matei, their faces frozen in moments now tinged with sorrow and fear.
Detective Tatu and Prosecutor Golescu arrive at Cami's abode, where they proceed to interrogate her mother. The mother reveals that, although staying overnight at work is not uncommon for her, she always makes it a point to call Matei to bid him goodnight. Suddenly, Golescu's phone rings, informing him of an urgent matter requiring his immediate return to the office. He entrusts Tatu with the task of completing the interrogation with Cami's mother and subsequently investigating Luca's apartment.
Elsewhere, Dracu cross-examines Bones regarding Crisi, noting that he was the last person to see her. Bones recounts that after searching Luca's apartment to no avail, Crisi expressed a desire to visit a priest but declined his offer to drive her. Following this lead, Dracu questions the priest, who discloses that Crisi had visited him a few days prior and was meant to collect a painting for Tanase's birthday the previous evening, but she failed to appear. Tili, joining the discussion, proposes revisiting Luca's apartment, hoping to uncover overlooked clues.
Golescu receives a pivotal clue from one of his colleagues. A hotel staff member captured footage during the evacuation following the murder, revealing Bones exiting a hotel room in one of the clips. His presence raises suspicion since he is neither a registered guest nor visible in any other hotel surveillance footage.
As Detective Tatu arrives at Luca's residence, Tili and Dracu, still inside, hastily take refuge in the bathroom. They eavesdrop on Tatu's conversation with Dracu, where he mentions discovering a missing rug and a bullet hole piercing through the wall, deducing it as evidence of a struggle. Golescu instructs Tatu to collaborate with forensics to ascertain whether rug fibers were found in the burnt car or if the deceased body bore bullet wounds. After Tatu departs, Tili and Dracu stealthily exit, intending to confront Bones once again.
At the clandestine safe house, Cami scours every corner and stumbles upon an arm encased in the freezer's icy embrace. Meanwhile, Bones meticulously monitors her every move through a network of cameras on his smartphone. After a quick trip to acquire some essentials to alter Cami's appearance, he's compelled to race back home.
In the bathroom, Cami orchestrates a clever trap, setting the stage for an opportunity to catch Bones off guard. With a swift motion, a bottle collides with Bones' head, leaving him dazed and bleeding, unable to retaliate. Cami delves into Bones' laptop, uncovering every detail about him, including his true identity as Marius Roman, an undercover policeman embedded within Tanase's notorious organization.
The arm in the freezer belongs to a victim Tanase had dispatched six months prior, dismembering the body. Bones confesses his involvement with Tanase, explaining that he can't turn over the incriminating evidence to the police because Tanase has corrupted nearly the entire force. He had posed as a confidential informant and recruited Luca as his insider, knowing his innocence and trustworthiness. Bones solemnly vows to safeguard Cami.
Dracu obtains Bones' address from Florin and, accompanied by Tili, heads to the safe house. Bones spins another tale, fabricating that Crisi, an identical twin to Tili, killed Cami because she recognized her from the hotel. He claims Crisi fled to Dubai, while he disposed of Cami's body. Unbeknownst to them, Cami hums softly in the bathroom. Fortunately, Tili doesn't recognize her voice, allowing Cami to assume the role of Sonia Lazar, Bones' former lover.
As Bones prepares for Tanase's birthday bash, Cami slips away to check on Matei. Meanwhile, Cami's mother hosts a wake for Luca at their apartment, where Cami watches Matei stealthily exit through the window. Just as he's about to escape, Tili and Dracu intercept him, quizzing him about his mother. Bones arrives just in time to prevent Cami from interfering, as they had come to verify his story. Officer Vasile steps in, detaining Tili and Dracu from further interrogating Matei.
The episode concludes at Tanase's extravagant birthday party, alive with the rhythm of live music and dance. Tili's growing interest in Bones and Cami incites Dracu's jealousy, almost causing him to lose his composure. Tanase interventions, quelling the tension. He tasks Dracu with discreetly locating Crisi, wary of police scrutiny amidst an impending deal with Lars. Cami eavesdrops on their conversation and later relays to Bones that the cartel is on the hunt for Crisi, and time is of the essence.
