Roubaud is consumed by a jealous rage when he discovers a sordid secret about his young wife's past. The only way he can rest is by forcing her to help him murder the man involved, but there is a witness — Jacques Lantier, a fellow railway employee. Jacques, meanwhile, must contend with his own terrible impulses, for every time he sees a woman he feels the overwhelming desire to kill. In the company of Roubaud's wife, Severine, he finds peace briefly, yet his feelings for her soon bring disastrous consequences. A key work in the Rougon-Macquart cycle, The Beast Within is one of Zola's darkest and most violent works — a tense thriller of political corruption and a graphic exploration of the criminal mind.
Emile Zola (1840-1902) was the leading figure in the French school of naturalistic fiction. His principal work, Les Rougon-Macquart, is a panorama of mid-19th-century French life, in a cycle of 20 novels which Zola wrote over a period of 22 years, including Au Bonheur des Dames (1883), The Beast Within (1890), Nana (1880), and The Drinking Den (1877).