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.

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.