The works included in the third volume of Boileau-Narcejac's collected works are unusually multifaceted and capacious in content to reveal the authors' writing credo. The most complex intrigue of the novel “The Engineer Loved Numbers Too Much” and at the same time the mystical exoticism of “The Conjuring”; photographic accuracy in depicting the morals of the Parisian bohemia of the novel “With My Heart Is Not in Right” and the fabric of the novel “The Tragedy of Errors”, rich in philosophical reflections on good and evil against the backdrop of echoes of the long-ended World War II. What unites these works is the invariably inherent feature of P. Boileau and T. Narcejac humanity and concern for the fate of man in the ruthless real world.