The crash of an English plane in Huelva will give the team information that will be their last mission before leaving Spain. Lucía, pressured by Schneider, will have to put everyone's lives in danger.

Shocked by Juan's death, Lucía decides to stop her activities as a spy. Nazis and English pressure her. The arrival of refugees and the danger that Amparo faces for being Jewish will make her help the English as a tribute to Juan.

Peter, although in love with Lucía, does not trust her and will do anything to prove her loyalty. The Nazis' plan against the British ambassador, who is coming to visit Huelva and for which Lucía will be the translator, will bring everything to light.

The Nazis have blown up the dock and only Lucia has seen the saboteur. But she is devastated by Agatha's death and angry at Peter for putting them in danger. The club's buses reveal that the saboteur will go to Seville, so Peter asks Lucía to accompany him. They will pretend to be married and look for the guy, whom Lucía must recognize. Schneider blackmails Amparo for bringing British spies into the German party and she will pay a high price to save her life. Peter and Lucía will prove to be the perfect "spy marriage."

The British spy services in Huelva, with Peter at the head, are going to have to be more effective since there is not much time left. The Germans have arrived in Paris and the swastika is already flying on the Eiffel Tower. London sends modern microphones that will help the team listen to the conversations of the Nazis in the Club. This way they can stay ahead of your steps. Especially now, that Italy has entered the war supporting Germany. Lucía accepts Francisco's wedding request, once again removing the ghosts of her mother, and Cinta, desperate, will go to a priest to seek peace and finally confess the secrets that she hides.

An Italian spy arrives in Huelva bringing classified information that both sides want. The Nazis go ahead and hide it in the German Consulate. Peter manages to contact the Italian and offers him to leave the country, without being very clear about his loyalties. Lucía, after seeing the war room, discovers that there is a team of spies in La Compañía. The British are going to celebrate the King's feast and Francisco invites Lucia, who fears being fired from her when Peter discovers that she is the governor's girlfriend. This invitation brings to light old secrets that implicate Rocío, Francisco's mother, and Cinta, Lucía's mother: she must prevent Lucía from going to the party with her son. For his part, Schneider appears at the party with Hanna, his daughter, who notices the governor. The English will use the party to get the Italian out of the country and Lucía finds herself inadvertently involved in the mission.

After the shooting in the port, Edward and Juan are injured and he asks his sister Lucía to look for Peter to give him important information. For his part, Francisco, Civil Governor in Huelva, has serious problems after the incident and questions his fiancée Lucía about the involvement of the British. While the British believe that Edward has died, Miss Parker pressures Peter to lead the spy team and shows him the war room, the center of British espionage, and London sends a new agent: Victor, Peter's best friend. But it brings back painful memories of a mission in Poland where he lost Sylvia, his fiancée.

Lucía manages to join the British Mining Company as a secretary after some very demanding tests. Miss Parker, head of personnel, and Peter, the manager, are fascinated by her exceptional qualities. But Lucía, although happy, has lied both in the interview and to her boyfriend, the Governor, Francisco Martín, whom she wants to marry. Intrigued by Peter, she will soon suspect that things happen at The Company that go beyond the administrative. For their part, the British suffer from a shortage of diesel to transport the mineral from Riotinto. Edward, an undercover spy, wants Peter to return to MI6, but a past trauma prevents him from doing so. Additionally, Peter has become addicted to opium painkillers. The relentless advance of the Nazis in Europe and Churchill's rise to power prompt Peter to embark on a dangerous mission, discovering that the Nazis are behind the fuel shortage. Lucía, who will be directly involved in the war between the two sides.