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.