After four months working undercover as the CIA's mole inside the DGSE, Malotru is threatening to cut ties with the Americans. While Marina discovers the indiscretions of Iran's gilded youth, the DGSE faces a crisis when one of ISIS's executioners is shown to be French.
In Iran, Marina is getting closer to the son of a high-ranking official. Nadia is transferred to Syria and placed under house arrest. In Paris, Cyclone returns to duty to get closer to the French Jihadist's family and Duflot is on a hunt for the mole inside the Bureau.
The Bureau is orchestrating an operation to recruit Sabrina, the French Jihadist's sister. Marina tries to learn more about Shapur's professional life, unaware that he is being watched by the Pasdarans. Malotru asks Celine to update him on Nadia's status in Syria.
Her mission compromised, Marina is exfiltrated to Paris, forced to distance herself from Shapur. Without access to Shapur, Malotru loses leverage with the CIA to secure Nadia's rescue. In Paris, the Bureau's task to neutralise the French Jihadist takes a step forward.
The DGSE no longer knows whom to trust with its missions and its agents. Malotru's double game backfires and Sisteron is on the front line for a risky mission: Sabrina and him are set to meet the French Jihadist. Shapur becomes a priority target again for the DGSE.
Sisteron's critical situation becomes the priority at the DGSE, where the hunt for the CIA's mole is still ongoing. Malotru is assigned to a new mission to help neutralise the French Jihadist. Finally, Nadia discovers that freedom comes with a price.
When Nadia holds the DGSE accountable, they take action to ensure her safety thanks to Malotru's inspired input. Meanwhile, Shapur is about to be recruited as an asset and Malotru is resorting to unorthodox means to bring an end to his mission regarding Toufik Boumaza.
Still embarked on their delicate mission, Celine and Malotru have to manipulate Andreas Schnabel, a German journalist with connections inside ISIS. Duflot is also struggling to understand how the Americans managed to double-cross them on their own ground.
Shapur's carelessness puts Marina in danger. The DGSE is holding the CIA accountable and demanding to know their mole's identity. The mission to neutralise the French Jihadist ends up in serious jeopardy and Malotru has to put his life on the line to achieve his end.
In Iran, Marina is being transferred to another prison. Meanwhile in Raqqa, Malotru is bent on bringing an end to his mission and finds himself waiting to meet Toufik with Schnabel.
After 6 years undercover in Damascus, agent Malotru returns home to Paris. At the DGSE, Malotru starts training Marina Loiseau, the Bureau's future undercover agent in Iran. Meantime, agent Cyclone goes missing in Algeria after a DUI arrest.
With Cyclone missing, the Bureau now has to handle the exfiltration of another asset in Algeria. Malotru rekindles his relationship with Nadia, but guilt and paranoia question her loyalty. The Bureau is cleaning Marina's record so as not to put her mission at risk.
Malotru decides to test Gherbi's loyalty by luring him into a trap. Nadia joins in on a mysterious meeting, but her regular “night-outs” soon arouse the suspicion of a Syrian agent. In the meantime, Marina successfully infiltrates the Paris Institute of Earth Physics.
At a French-Algerian meeting, Malotru attempts to read the other Algerian officers to find out whether or not they're holding Cyclone in detention. At the Paris Institute of Earth Physics, Reza starts flirting with Marina, who must now find a way to rebuff his advances.
When Sisteron goes after Cyclone in Algiers, another agent known as Pigalle reaches out to Malotru with potential Intel on Cyclone. Concurrently, the DGSI subjects Marina to a tense interrogation, suspecting that she may be working for the Iranian Secret Services.
Wanting to trade Pigalle's intel on Cyclone, Malotru must find a way to uncover the former's true identity and underlying motive. Still on a mission to unmask Malotru, Nadim locates Prune and asks about Paul Lefebvre. Marina must act to keep Jérôme from going to Iran.
Kerbouche finally unveils the truth about Cyclone's life-or-death situation and the Ministry of Foreign Affairs finds out about the secret negotiations. The DGSE sets out to recruit Nadia as a new asset, but Marie-Jeanne is not convinced Nadia will accept the offer.
The DGSE recruits Lefkir's secretary to plant a tracking device on him. Nadia cannot set out to betray her country and refuses to join the DGSE. In Paris, Marina is introduced to Reza's wife Azar. Although smitten by her, she finds Azar is asking far too many questions.
The DGSE pretends to accept a deal offered by the Algerian DG. Mag secretly asks Malotru for a plan B to avoid foreign interference. Malotru is shaken by a message that Nadia is to be tortured. Marina passes her final intelligence test and leaves the country for Iran.
Sisteron is anxiously waiting for Cyclone's release. Malotru takes time off the Cyclone op - now in the hands of the Action Division – and secretly meets up with the CIA. Marie-Jeanne starts to worry when she discovers Marina has been removed from her plane to Iran.
Chased by the DGSE and the CIA all the way to Moscow, Malotru tries to negotiate his return to France. The DGSE's new head of Internal Security, JJA, initiates a full-spectrum audit of The Bureau, with the clear-cut intention of severing a few heads in the process.
Malotru comes out of hiding and is quickly located by the Russian secret services. At the DGSE, Liz manipulates Sisteron to cause distrust between him and Marie-Jeanne. Marina begins to navigate the underside of the hacking culture at a Russian research centre.
Arrested for espionage by the FSB, Malotru is tossed aside and left to the mercy of other inmates. Marina's phone has been hacked and used in a cyberattack against the Boulgakov Centre. Back in Iraq, Jonas suspects that a seemingly repentant Jihadist may be playing him.
While under intense pressure from the FSB to cooperate, Malotru is considering how to approach a cyber operations officer. Back in France, Marie-Jeanne seeks Mag's advice, only to find out that JJA had coerced him to resign and that she could very well be next.
Just as Karlov is beginning to lose patience, Malotru suggests recruiting Ellenstein. Back at the DGSE, Marie-Jeanne is monitoring a cyberattack. Meanwhile in Mosul, Jonas and Jean-Paul are searching for a way through the ravaged city to get to the Collector.
Under Karlov's gaze, Malotru initiates Ellenstein's recruitment. At the DGSE, Sisteron suspects César is not ready to go on a mission and will not be able to hold his legend undercover. In Raqqa, Jonas and Jean-Paul join a battalion of Yazidi women to track down Iode 3.
In Moscow, Malotru welcomes César, who has taken Ellenstein's identity. Their meeting is taped and scrutinised by both Karlov and a psychologist. Back in Damascus, the authorities refuse to let Jonas or Jean-Paul access the morgue, where Iode 3's body most likely lies.
Karlov asks Malotru to join the FSB in Moscow. In Paris, Sisteron and the entire Bureau must answer to an inquiry questionnaire on Marie-Jeanne, which JJA intends to use against her. Meanwhile, Marina is resenting the way the Bureau is using Micha.
Sisteron warns Marina that her cover has been blown, but that her arrest could help on another crucial assignment. Meanwhile, Malotru parts ways with Samara and comes back to France. Back in Syria, Jonas has lost Iode 3's track and must turn to AI to try and find him.
In Ukraine, Malotru arrives to get Marina but on the way back their convoy deviates from the route initially agreed upon, forcing him to warn Sisteron. Quickly seeing Malotru's life is at stake, Marie-Jeanne confronts JJA and Ponte. Meanwhile, Jonas interrogates Iode 3.
Malotru is still held captive by DAESH and the DGSE enlists Nadia and her Syrian connections to come up with a rescue plan. Tensions mount as the CIA is afraid Malotru's release could bring his treason to the public light. Meanwhile, Marina is sinking into paranoia.
As Nadia finally initiates the negotiations between DAESH and the DGSE, Malotru finds a first glimmer of hope when one of his guards - a Russian mole for the FSB - offers to help him escape. Duflot must also take charge to help Marina cope with a worsening case of PTSD.
Malotru's latest hopes are dashed when the FSB mole - the only man able to help him - is hurt in combat. Meanwhile, Marina is approached by Phillippe, who pretends to work for the DGSE but is actually a Mossad agent here to recruit her.
A high-ranking DAESH general uses Malotru's latest proof-of-life video to send an old coded message to the DGSE and let them know he is ready to defect. Philippe begins to train Marina, still thinking she is just a rookie, and asks her to speak at a conference in Baku.
Jihadist forces are closing down on Malotru and the Russian agent, who must fight for their survival while alone on enemy territory. Duflot is preparing to go out into the field in Syria to meet with Cochise, who may be his only chance to get Malotru out of DAESH alive.
Malotru must struggle on his own to survive and escape his pursuers in Syria. Duflot is on his way to meet Cochise on the banks of the Euphrates. Meanwhile in Baku, Marina is offered a position at the Seismology Institute.
Marina's paranoia takes over again in Baku, putting her mission in serious jeopardy. In a tense encounter, Duflot negotiates for Cochise's defection, on the sole condition that Malotru be released.
The DGSE is going through its darkest hour and Marie-Jeanne is on the frontline to keep everything on track. MAG greenlights an operation to exfiltrate Cochise and rescue Malotru at the same time. Meanwhile in Baku, Marina carries on with her mission for the Mossad.
The Bureau is pulling out all the stops to try and locate Malotru. Nadia and Prune are both called upon to help, but Malotru has covered his tracks. The wind is turning for Marina in Baku when Philippe finally realises that this mission may not be her first after all.
Philippe is holding Marina captive, and the Mossad is more than ready to finish her. Back in Paris, Marie-Jeanne finds out that Nadia and Malotru are planning to meet in secret and she is more determined than ever to use this opportunity to arrest him.
The DGSE is unsettled when an article about Malotru’s death in Ukraine gets published. An investigation opens to find out how the intel got out. Marie-Jeanne, now an agent handler based in Cairo, is forced to work with a disturbing spy from the Egyptian secret services.
The Bureau is looking for César after he failed to catch a flight to Riga. JJA is still confident his plan to infiltrate a double agent into Russia’s FSB is a success, but nothing’s certain: what if the agent in question, Pavel Lebedev, doesn’t play by the rules…?
Pavel Lebedev starts his job at the FSB. More paranoid about Russia by the day, JJA tries to contact Pavel to assign him a mission. Sisteron is sent to Cairo to verify if Marie-Jeanne is behind the leaks. Marie-Jeanne takes on a new trainee: Salim, the sheikh’s son.
Bakatine’s investigation of Lebedev creates conflict with Karlov. JJA manages to track down the source of the article. When Mille Sabord asks questions about Paul Lefebvre’s past, JJA has to step in and handle him. Pavel Lebedev accepts JJA’s deal: he’ll recruit Karlov.
Pavel provides a file on Karlov but Ponte refuses to endorse his recruitment, fearing it might compromise César’s mission. Bakatine is in Phnom Penh to investigate César. Mille Sabord gets a little closer to a Saudi Intelligence agent and finds leverage for recruitment.
Jonas goes to Cairo to strike a deal with the sheikh. César supervises a huge cyber attack on various European institutions: one of the targets of the cyber attack was a Belgian hospital. The Bureau is in a dilemma: should they bail the hospital out or protect César?
Paul Lebedev sees Nadia again. Mille Sabord is snooping around to find out about Malotru’s past, making The Bureau very nervous! Sisteron informs DGSE’s security division; Marina is brought in again. In Cairo, Marie-Jeanne’s hotel is the subject of a terrorist attack.
Karlov slowly uncovers the vice that’s tightening around him. Ready to recruit Karlov, Lebedev decides unilaterally to organise Nadia’s extraction. This could sabotage the whole operation devised by JJA! Meanwhile, Bakatine is inches away from discovering the truth.
Having returned to France, Marie-Jeanne is put back in charge of The Bureau. Sisteron is managing the office responsible for handling intel from Karlov. Paul has also been extracted and is now in quarantine. Jonas suspects his new girlfriend might be a foreign agent.
Paul believes Karlov was contriving to harm him: he enlists Sisteron’s help in tracking down this suspected time bomb. Jonas finds damning proof on his girlfriend. As Marie-Jeanne continues her campaign for the job of director, she realises not everyone is on her side.