Explain how Maria Teresa gets involved with the underground.

In July 1957, Maria Teresa writes in her diary that Minerva is moving to Monte Cristi with Manolo after graduation. Trujillo, however, plays a terrible trick on Minerva by not actually granting her a license to practice law; her diploma is useless. Maria Teresa helps Minerva set up her new home in Monte Cristi, and it comes out that Manolo is cheating on Minerva with another woman. By August, though, the couple is "on the mend," and Minerva credits Maria Teresa with bringing them back together.

In her entry of September 28, 1957, Maria Teresa reports that she accidentally intercepted a delivery of guns from Leandro (codename Palomino) to the house. Manolo and Minerva explain about the national underground that's forming, and Maria Teresa joins them. Maria Teresa begins to fall in love with Leandro. Maria Teresa becomes a hub of a revolutionary cell, living with Sonia and storing deliveries in the "munitions room." While Sonia is away in La Romana, Leandro comes over and says that he is going to stay with Maria Teresa to protect her. Maria Teresa ends up marrying Leandro on Valentine's Day, 1958.