Azaría is a peaceful, untroubled mountain village, with white cobbled streets, isolated from the political unrest of a country governed by the dictator Miguel Primo de Rivera. This peace is suddenly shattered by the mysterious killing of an elderly brother and sister: Cándido and Paquita Gutiérrez. The hasty intervention of the Civil Guard, which takes into custody and brutally interrogates one of the inhabitants, causes a rebellion in the village, which leads the central government to send in Inspector Roberto Martín. In parallel, Inés, a spinster of just twenty-seven, nicknamed the Boyfriend Crusher because of her strange sense of guilt and innate rebellious spirit, investigates the double murder on her own account, despite her limited resources and the secondary role played by women at that time.