In the Beguinage, they have to choose Lucrecia's successor as Great Lady, while Lucía discovers that her mother was poisoned and is determined to find out who killed her.

Determined to discover the secret, Lucia follows the trail of the enigmatic correspondence that her mother maintained with a beguine from Leuven. But Catalina's betrayal in telling Munio about her advances frustrates her investigation. Catalina allows herself to be carried away by the fear that the people have towards the freed women after the attack that Simón suffered at the party in honor of the Great Lady. The visit of a commissioner of the Inquisition and the discomfort of Marie Anne who begins to suffer hallucinations, represent unbearable pressure for the Beguines. Sibila delivers Lucía to the Holy Office while Telmo promises to do everything possible to get her out of there.