The Beast Within is a near perfect blockbuster, combining clear and lucid writing with driving action in an exciting story. Zola's characters are interesting, complex, human and understandable if often revolting. To cap it all, Zola has things to say about the impact of technology on society and individuals, the nature of psychopaths and the motives for murder. It's a great page turning mixture.
Jaques Lantier (who is the brother of Etienne Lantier, the Hero of Zola's Germinal) is a handsome express locomotive driver on the Le Harve - Paris run. Rejecting his old childhood sweetheart, Flora, he takes Séverine Roubard as his lover, in the knowledge that she and her husband have murdered Grandmorin, a director of the railway company, who had previously sexually assaulted Séverine. Jacques keeps their secret but harbours one of his own, that he has a psychopathic desire to murder women. Flora meanwhile plots her revenge on Jacques and his lover whilst her stepfather is slowly administering rat poison to her mother.
All-in-all then, a lot of people in this book are thinking about or committing murder and this allows Zola to work his way very deftly through some of their various motives and, more interestingly, their states of mind before, during and after the act. The various crimes don't go undetected and the law is shown as being prey to the requirements of politics, business, careers and society. So that evidence is suppressed or ignored to get the right outcome. This is all too believable and closely mirrors miscarriages of justice that occur in our own time.
As with Germinal, Zola uses the world of new technology - in Germinal the mining industry, and here steam trains - as a relevant and useful background to the story. The animal-like characteristics of the trains echo the feelings of the characters, whilst the technology itself is clearly dangerous and exciting. The railway also dislocates people by moving them rapidly from place to place and creates monotonous dehumanizing jobs for the line workers. There are many minor characters involved with the railway and each has their own little story of petty jealously and rage. Put together, this creates an edginess that creates possibilities and sub narratives. Zola asks the reader to think about what technology does to people's lives and whether it is nature or the railway that has created the murderers.
Best of all this is a right rattling read and it's possible simply to enjoy the story and want to learn what happens next. Zola keeps the action and sub plots flowing and has several terrific action set pieces as well as moments of sexual passion and personal rage. In amongst all this there is tenderness and affection, human frailty, manipulation and emotional intelligence. This is a very smart book and I recommend it.