Watch "Monster: Season 1" on Netflix USA

Just as renowned neurosurgeon Kenzo Tenma grows tired of hospital politics, he is faced with a difficult decision that carries huge consequences.

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While the boy's operation is a success, the mayor is not so lucky. Tenma sees his prospects at the hospital crumble and his engagement canceled.

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Tenma learns about the deaths of those responsible for his downfall. Although he is the chief suspect, his career starts to progress once more.

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Lunge interrogates Junkers after his surgery but has no success. After Tenma gets him to open up a little, another mysterious killing occurs.

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Nina Fortner, a bright university student, starts receiving strange anonymous emails. Tenma's investigation leads him to an old man's apartment.

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Tenma and reporter Maurer work together to prevent harm from befalling Nina, who decides that meeting the anonymous messenger may help her memory.

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Tenma and Nina make a shocking discovery at the Fortners' house. When two detectives arrive to take them to the station, Tenma suspects they're lying.

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Tenma returns to work after Nina leaves him a note and disappears. Inspector Lunge visits Eva to ask about the necktie found at the crime scene.

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Lunge interrogates former soldier Bernhardt about Tenma's whereabouts. Five months prior, Tenma learns how to fire a gun and improve his fitness.

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While looking for Johan, Tenma encounters seasoned burglar Heckel, who says he can help him if he agrees to perform some dubious medical work.

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Tenma visits the Liebert residence in Berlin where Johan and Anna grew up. He learns from a local that they arrived from a now-abandoned orphanage.

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Erna opens up about the dark history and exact purpose of 511 Kinderheim to a concerned Tenma. Dieter receives an unwanted visitor at the hospital.

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Tenma and Dieter travel through a small village, where Tenma's medical expertise and helpful nature catch the attention of the local doctor.

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While Lunge investigates the murder of a prostitute with ties to a politician, Eva visits him in his office to ask about the investigation into Tenma.

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Nina enters a bar in Frankfurt under a guise to try to find Johan's whereabouts. Tenma follows soon afterward based on information from Nina's source.

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Nina learns of the plot to burn down the Turkish district in Frankfurt. Dieter learns about the car hitting Tenma, who takes a beating in captivity.

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Tenma defies Wolf and heads back to Frankfurt to thwart the fire plot. Nina uses a gun to compel The Baby to tell her where the main fire will start.

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The police talk to Nina about the fire before she reunites with her old acquaintance Rosso. Nina recalls her time working in his Italian restaurant.

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Tenma visits old friend and criminal psychologist Gillen to discuss Johan, but the meeting backfires when he suspects that Tenma is the killer.

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On their way to Freiham, Tenma and Dieter hitchhike with an elderly English couple. The husband, a former police officer, gets suspicious about Tenma.

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Now retired, Detective Muller hires an investigator to update him on Tenma, Nina and Messner. He opens up about the Fortners to his bodyguard.

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Lunge investigates the murder of a middle-aged couple in Hamburg and uses the case as an opportunity to try to lure Tenma into a trap.

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Eva wakes up in a police station holding cell after a night of heavy drinking and realizes her bag is missing. She soon gets acquainted with Roberto.

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Tenma treats a man in Fussen who has former ties to the criminal underworld and hears that Johan may have been involved in his criminal organization.

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Wealthy old man Schuwald employs university students to read to him each night. One of them, Karl, investigates Schuwald's suspicious activities.

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At Schuwald's request, a private investigator looks into Fahren's suicide. Karl meets Johan and opens up about his own childhood in foster homes.

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Richard hopes to reconnect with his family and tries to avoid the temptation to drink again. Karl faces difficult decisions about family.

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After Schuwald tells him to stop investigating Fahren's death, Richard reviews old unsolved murders and notices a connection between the cases.

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As part of his investigation, Richard tails Johan and later goes to meet a couple who could be his parents. Reichwein discusses Johan with Gillen.

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Reichwein doubts what he hears about what happened to Richard and starts his own investigation, leading him into some dangerous situations.

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Reichwein says he'll help prove Tenma's innocence as the two share information. They head to one of Schuwald's enterprises, where they spot Johan.

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Lotte befriends Nina at the library and notices her resemblance to Johan. Tenma practices with a sniper rifle and searches for a spot to shoot Johan.

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After several children fall to their deaths, one survivor explains the incidents' connection to Johan, who seems to know that Tenma plans to kill him.

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Lotte learns what caused Johan to pass out. Johan receives a letter signed "the Red Hindenburg" and visits the red-light district to follow up on it.

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Instead of spending time with his daughter, Lunge learns about Tenma's character by meeting with some Japanese businessmen who knew him well.

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Reichwein visits Schuwald to explain Johan's monstrous history. On the day of the book donation ceremony, Tenma lies in wait for the event to begin.

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After reading the book that caused Johan to pass out, Nina rushes to the library. With his target in his sights, Tenma prepares to pull the trigger.

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Tenma and Roberto face off on the balcony while the fire grows in the library. Amid the raging flames, Johan calmly narrates the scene to Schuwald.

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In the aftermath of the fire, Lunge meets Karl at the hospital and starts to believe that Johan might really exist, but he struggles to find evidence.

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On a train to Prague, Grimmer, a journalist investigating the misconduct at 511 Kinderheim, meets Tenma and helps him evade the authorities.

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Grimmer ruffles feathers by following former Kinderheim director Petrov around Prague and trying to obtain evidence of its immoral experiments.

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A police inspector asks Grimmer about Petrov's death and last words. Later, Grimmer tries to prevent the key from falling into the wrong hands.

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Detective Suk finds the bodies of his mentor and his accomplices at a crime scene. As he drowns his sorrows, he sees a familiar-looking girl.

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Suk interviews the children from Petrov's orphanage about Grimmer, but they only have kind things to say. Tenma learns more about the twins' mother.

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The new police chief suspects Suk's involvement in the recent corruption and has him followed. Suk and Grimmer meet and finally use Petrov's key.

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Tenma reads about Suk's case and the Czechoslovakian secret police crime syndicate. He visits Suk's mother, who reveals the location of his hideout.

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Arriving in Prague with Dieter, Nina is stunned when several people call her Anna. Tenma and Grimmer search for Suk but struggle to locate him.

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Tenma and Grimmer arrive at the hospital to retrieve the tape from Suk's mother, only to surmise that Johan had visited her just before they did.

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To prove Grimmer's innocence, the boys from the orphanage decide to find the blonde girl who killed Petrov. Grimmer and Tenma pay them a visit.

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Lunge interrogates Suk in the hospital. Later, he gets permission from Ranke to tear down a wall and access a secret room in the Red Rose Mansion.

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Dr. Reichwein talks with Schuwald about his trip to the Three Frogs, reminding Schubert about his time spent there. News of Tenma's arrest spreads.

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Imprisoned in Germany, Tenma is asked by the guards to help treat another inmate: Milch, a conman with a long history of successful prison escapes.

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After Tenma learns the true identity of his lawyer and the plans to kill Eva because of what she knows, he considers fleeing the prison with Milch.

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Roberto maneuvers closer to Eva while her guard is down. Gustav prepares to break Tenma and Milch free from the prison van with a dangerous ploy.

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Tenma tracks down Eva's hotel room in a bid to reach her before Roberto does. Verdemann gets a surprise visitor, who asks him about his father.

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Tenma starts the long journey to the Red Rose Mansion. Nina and Dieter wander around Prague looking for the same building, guided by Nina's memories.

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Nina recalls her and Johan's adoption, playing together as children, and the night he murdered their parents and asked her to shoot him.

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Suffering with a gunshot wound, Eva's bodyguard Martin asks to see Tenma. Two months prior, he reluctantly takes on the role of protecting Eva.

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Martin encounters Tenma in a diner and beats him up. After attending a party with Eva, Martin once again meets Tenma, who demands information.

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Martin goes to kill Eva, but he can't pull the trigger and helps her escape. When the organization's men find him, a fierce gunfight breaks out.

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Nina visits key locations in Prague in an attempt to trigger her memories. Suk and Verdemann interrogate people who visited the Red Rose Mansion.

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Police find Tenma, but a van runs him over in the resulting chase. He awakes in the house of a dentist named Milan, who bears a grudge against Capek.

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The day before his retirement, Inspector Weissbach escorts a serial killer who talks about his motives and his link to young Johan and Anna Liebert.

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The Baby has dinner with a dancer after he takes a special interest in her. He talks with Capek about his concerns over Johan and the latest murders.

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Johan surprises Capek in a tense encounter. When Capek's men go to retrieve Nina from her hotel room, they find her waiting for them with a gun.

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Capek explains to Nina how her parents met as the result of an experiment, the circumstances of her birth, and the true mastermind behind it all.

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In the burned ruins of the Red Rose Mansion, Johan describes to Nina his childhood abduction from the Three Frogs and the day of the mansion massacre.

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Lunge visits the sleepy town of Ruhenheim and suggests that the police should be on alert. He later encounters Grimmer, who is using an alias.

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The Heinichs grow more paranoid after finding Mr. Konrad's body. After telling Nina what he learned about Bonaparta, Tenma meets Lipsky in Prague.

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In the pouring rain, bodies start to appear all over town. Grimmer comforts Wim before he and Lunge reveal a shocking truth about the hotel owner.

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Grimmer prepares to defend the hotel. While Tenma helps some residents of Ruhenheim escape and Lunge searches for answers, the two come face-to-face.

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Lunge sweeps the hotel looking for Roberto. When Tenma tells Bonaparta about the letter found at the Red Rose Mansion, Bonaparta makes a confession.

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Nina and Gillen rush toward the action as Tenma finally comes face-to-face with Johan, who urges Tenma to take his life by threatening Wim.

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Karl tells Schuwald about what happened to Tenma, and Eva speaks with Reichwein about her improvement. Suk, Verdemann and Lunge pay their respects.

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