The news of Lucrecia's murder reaches the Avellanedas and the Beguines point out Catalina as a spy. Lucía defends her, certain of her loyalty and steels herself to discover the truth. With the help of Telmo, Lucía meets a hired thug who was unable to kill Lucrecia and who commits suicide shortly after, which arouses suspicion towards the Avellanedas. Munio's pressure causes the beguinage to lose benefactors. Guilty, Lucía helps with the sale of her wedding dress. A gesture that puts her at odds with Rodrigo and jeopardizes her stay in the beguinage.

The days in the Inquisition prison weaken Lucía who, after Telmo's risky visit to confess her love, decides to heed Lasarte's advice and fake her madness to escape confinement. But, far from assuming her salvation, Lucía ends up in the custody of her brother and with the news of the happy marriage between Telmo and Juana. And Lebrín orchestrates the marriage knowing the danger that his friend suspected of being a Judaizer is in danger. Meanwhile, Marie Anne and Gabriela let themselves go and recover their forbidden love story.