The story is set against the backdrop of the French railway system, with trains and railways serving as both literal and symbolic elements. The protagonist, Jacques Lantier, a train engineer, struggles with a hereditary mental illness that manifests as violent impulses, particularly a monomaniacal obsession with killing women. Lantier's inner torment is a key focus of the novel, as he battles these urges while trying to maintain a semblance of normal life.The plot also follows a series of other intertwined characters, including Séverine Roubaud and her husband, who are involved in a murder conspiracy. Séverine eventually becomes romantically involved with Lantier, leading to a complex web of passion, violence, and betrayal. The train, a powerful symbol of industrial progress and uncontrollable human instincts, plays a central role in the unfolding tragedy.