The tale begins with a nostalgic reflection by the narrator, who recalls the village of his childhood and the enigmatic forest that loomed beyond. Through his encounter with the eccentric Mocquet, the story of Thibault, a shoemaker’s apprentice, comes to light. Thibault, wounded by a local nobleman’s arrogance, makes a vengeful wish that sets supernatural events into motion. He meets a mysterious black wolf, a manifestation of Satan, and enters a Faustian pact. As Thibault's powers grow, so does his isolation and suspicion among villagers. He is both feared and admired as wolves begin to follow his will, earning him the title of "The Wolf-Leader." This part explores how vengeance, pride, and the allure of forbidden power corrupt a young man.