In the wake of a series of bombings and cyberattacks in Stockholm, the Swedish Secret Service SÄPO is struggling to find the organization responsible for the attack. These are trying times for anyone employed in the most secretive of government jobs. Nobody knows that as well as Carl Hamilton, who has absolved years of Navy SEAL training. Having just returned to his home country, Hamilton is enlisted to rejoin an elite black-ops division of SÄPO. At the same time, he is being identified as a possible suspect by agent Kristin Ek. Haunted by his past and unbeknownst to his superiors, Hamilton is suspected to be a double agent for the CIA. After Hamilton and Kristin engage in a wild goose chase across the world to get to the bottom of the attacks, they soon discover that there are darker forces behind the bombings than the usual suspects. An organization taking advantage of fake news, xenophobia and terrorism in order to turn a profit. It's the new Cold War: As loyalties are put to the test, Hamilton is forced to choose what future is best for his country in an age where multinational business interests are the new ideologies…
When Carl Hamilton returns home from a secret CIA-program in the United States, Stockholm is hit by a series of bombings and cyber-attacks. Hamilton kills the suspected terrorist Rashida after a violent encounter but is unable to stop the attacks. Home Secretary Lindgren, whose secretary Norling is injured in the attacks, demands to find those responsible. SÄPO (Swedish Security Service)-agents Kristin and Birger initiate a hunt for the terrorists, which soon forces them to go beyond the confines of their job description.
Hamilton travels to Palestine on a mission for OP-5 in order to find out more information about the terrorists and their agenda. The meeting with PLO escalates quickly after they discover that Hamilton killed Rashida. It turns out that she was a PLO-agent, on a secret mission to stop the terrorists in Stockholm, not help them. A violent chase ensues, and Hamilton is forced to escape. Kristin and Birger's investigation surrounding the terrorist attacks leads them to suspect that Hamilton was involved.
Hamilton returns to Sweden, starting off his homecoming with meeting Sonja. Kristin and Birger make progress in the hunt for the terrorists and discover that they are hiding on a ship headed for Germany. Hamilton sets up a secret meeting with his CIA-boss, Haig. DG and his colleague Astrid begin to investigate how the murder of Elena's boyfriend Borisov is connected to the terrorist attacks. DG gives Hamilton a mission to infiltrate Borisov's office at the Russian embassy.
Hamilton starts working at SÄPO to Kristin's great surprise and dismay. He immediately befriends Birger who helps him find out that Norling hid an USB-hard drive with secret information in a storage facility. Elena, hidden in a safehouse in Stockholm, manages to sneak away from Astrid's supervision and meets Norling who directs her to the same storage facility, without noticing she is being followed by Mike, the assassin.
Hamilton and Kristin arrive in Hamburg to help BND in the hunt for the terrorists. Astrid investigates Elena's death. DG finds out that Hamilton is a double agent working for the CIA. American security-specialist Pence convinces Swedish State Secretary Gripenberg to pay off the cyber-terrorists responsible for the hospital outage, preventing them from carrying out further attacks. Unfortunately, they are unable to prevent Norling's death. Hamilton tracks the terrorists to a warehouse in central Hamburg.
Hamilton changes his mind at the last second, saves Kristin from the burning warehouse and brings her to a hospital. When Haig discovers this, she orders Hamilton to kill Kristin. He refuses and breaks contact with Haig. After both of them return home, Kristin's husband Rikard finds out that she has been unfaithful to him and she is forced to spend the night at Birger's house. Hamilton, wanting to get away from everything, travels together with Sonja to her summer cabin.
Hamilton tracks down Sonja to tell her the truth. Their meeting is cut short however when the police brings her in for questioning. Birger helps Hamilton dig up evidence of Haig lying about his mission. He sets a meeting with her, which turns out to be a trap. Hamilton overthrows Haig's henchmen, but she is able to escape. After their encounter, she leaks false information about Hamilton playing a guilty part in the terrorist attacks, resulting in him becoming wanted by the police.
Kristin begins interrogating the arrested Hamilton. She discovers that he worked for Haig and that somebody has framed him. Kristin's relationship with her husband Rikard reaches it's breaking point. DG quits his job when SÄPO empty OP-5's offices. He advices Astrid to do the same. SÄPO arranges a press-conference to let the public know about Hamilton's involvement in the terrorist attacks. Haig orders Hamilton's assassination. Kristin's investigation leads her to Astrid.
In order to find the intel which Borisov passed on to Norling before his death, Hamilton travels to Ukraine, unknowing that Haig has hired assassins for the same goal. Haig turns out to be working for Pence, who convinces Gripenberg into buying his cybersecurity-system after the latest cyberattacks. After a visit from SÄPO, DG decides to return into the battlefield. Hamilton succeeds in finding Norling's USB-drive which had been hidden by Mike.
During a top-secret NATO operation in the Mediterranean, a Swedish attack diver is murdered. Hamilton knows the victim from his time as a Navy SEAL and travels to Toulon's military base in the south of France to investigate the incident.
Hamilton and Kristin go undercover to get more information about the background to the murder. A dangerous hunt, which ultimately affects the whole world, leads via the Riviera's casino to exclusive villas and out to the Mediterranean.
Complete episode guide for Hamilton with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
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Hamilton travels north to uncover a suspected research espionage on the Kiruna Space Project. At the same time, a truck crosses Sweden's border via Finland. Someone seems to be systematically stealing secret weapon material from Sweden
All information about the operation is classified and Hamilton is sent to Brussels as a bodyguard for the Minister of Defense. At the same time, a group of rebels is preparing for a violent action in connection with an EU summit.
Hamilton has to leave Lykke in the middle of an engagement party, but his desire to live a normal life continues to grow. Important information risks falling into the wrong hands when a researcher is kidnapped and blackmailed.
Hamilton comes home to Lykke and makes plans for the future, but first he has to finish an assignment that becomes increasingly frightening. Hamilton travels to Lithuania's border with Belarus to face the terrorists.
