The siege tightens around Tomás. He tries to talk to Toscano's widow, who suffers from Alzheimer's and doesn't remember looking for him. Only later, in a moment of lucidity, does Luísa take him to Toscano's tomb, where she shows him a safe that her husband left her and a riddle for Tomás to solve. The cryptanalyst strives to decipher the enigma as he becomes increasingly involved with Helena. Vitória is seriously injured in a confrontation with neo-Nazis, in an attempt to vandalize the Padrão dos Descobrimentos. Pressured by the foundation for answers, Tomás travels to Genoa and relates the enigma that was left to open the safe with Umberto Eco's work, "Foucault's Pendulum". The discovery is interrupted by the arrival of a mysterious woman, Manuella, who wants to talk to him about the Foundation but, upon realizing that they are being watched, she invites him to follow her. On the street, the two are chased and Manuella is fatally run over before she can tell what she knows.