Rachel and Émile go into crisis control mode due to a shooting near the American embassy. The attack seems to target Yasser Chadli, a pacifist political dissident from the Shammar emirate.

Rachel works hard to uncover the reasons for the attack; Émile is put under pressure to verify the identity of the CIA double agent; two agents are assigned to the Chadli case.

The CIA gets in contact with Rachel; at the SSC, McKenna, the boss of the Quebec division, must handle the intrigues of Bartoli, the national security advisor.

Émile is torn between his love for Rachel and his professional pledge; Shammar's secret services seem to be responsible for the intimidation of Yasser.

The CIA brings Rachel to Vermont and interrogates her thoroughly; Émile becomes radioactive within the SSC.

Émile hides his dismay at Rachel's double life in order to reassure his daughters. He then tries to advance his investigation into the covert activities of the Shammar secret services in Montreal.

Émile finds out about the existence of an order to eliminate Rachel; for her part, Rachel informs the CIA that she believes they have received misinformation from another of their sources in the Canadian government.

Bartoli orders the SSC to stop protecting the Chadli and leave them to their fate; the operation of the Shammarian secret services in Canada becomes clearer; Émile and Logan are trying to find Irene, whom the Shammarians have still held captive.

The return of Rachel to the country disrupts all the agendas and the lives of people around her; the hunt for the double agent becomes the number one priority.

Rachel's secrets from the past resurface; the Shammarian secret services carry out their planned attack; Irene gets her revenge.

In the remote region of Ghanim in the Maghreb, two Quebec engineers are taken hostage; Rachel supervises, on orders from Ottawa, an unsuccessful attempt to capture Robin Denard, a French mercenary passing through Montreal.

The search for Denard gains momentum, but he thwarts it and mocks the SSC; while investigating the hostage situation, Thomassin consults Philip Miller, who has fallen into disgrace.

Rachel meets with Uncle Sergei, the station head of Russian intelligence services, and finds out that Denard is in Montreal to execute a hit; Sarah goes undercover and interacts with the hostages' spouses to ensure that they do not cause a stir.

Anne and her lover Théo get a close look at Denard's power; Rachel is compelled to meet Philip to give him some terrible news; one of the hostages succumbs to the mercenaries' pressure and shares vital information.

A lead helps Rachel pursue Denard's trail; Rachel's colleagues find that she is keeping secrets from them about Denard; Rachel continues to get closer to Fabien.

Theo gets anonymous information about Rachel that piques his interest; the professional past shared between Rachel and Denard emerges and further complicates the matter.

Denard's trap makes the management team doubt Rachel; a frightened Rachel mistrusts everyone close to her and can only count on Valérie.

Rachel learns about an associate of Denard and finds how he goes about always being one step ahead of her; Denard meets the leader of a drug cartel.

Rachel negotiates with an associate of Denard and the hunt around the latter intensifies; in order to protect his colleague, one of the two hostages tells all his secrets to the mercenaries.

A rescue operation is laid out to free the captives at Ghanim; Rachel sets up the last levers of her own revenge; Denard attacks one of his relatives.