Derues: Celebrated Crimes

In Short

This narrative centers on Antoine-François Derues, a French grocer and money-lender whose life was a long, systematic campaign of fraud and murder. Moving from petty theft in his youth to the calculated poisoning of a mother and her son in 1777, Derues utilized his reputation for religious devotion as a shield against suspicion. The book endures because it is a chilling psychological study of a "complete type of wickedness"—a man who lacks grandiosity or courage, finding his power instead in the mundane, reptilian persistence of his own greed.

The Story

The story begins with the early life of Antoine-François Derues, whose childhood was marked by a chilling lack of remorse. Expelled by his own family for theft, he demonstrated an early, jarring confidence, taunting his elders even while being punished. As an adult in Paris, Derues evolved into a sophisticated predator. He mastered the persona of a humble, pious, and sickly shopkeeper—a man who, while looking like an infirm caricature, used his apparent fragility to disarm those around him.

The central arc of the book concerns his calculated destruction of the Lamotte family. Through a series of social maneuvers, Derues gained the trust of Madame de Lamotte and her young son, Edouard. By suggesting he could assist them in financial and social matters, he lured them into his orbit. Once they were under his "protection" in Paris, he systematically murdered them. The horror lies in his administrative approach to homicide; he did not simply kill his victims, he attempted to "process" them, creating a trail of forged documents, fake receipts, and elaborate lies to convince the husband, Monsieur de Lamotte, that his wife and child were still alive and traveling.

As Monsieur de Lamotte began to suspect the truth, Derues engaged in a desperate, high-stakes game of manipulation. He appeared before magistrates, weaving a web of slander against the missing woman to explain their absence, painting her as a secret adulteress hiding from her husband. However, his meticulous efforts eventually unraveled. The public, sensing the truth long before the law could confirm it, fixated on the case. Evidence—including the discovery of the bodies and the exposure of his fraudulent financial contracts—eventually forced the truth into the open.

The ending is as stark as the crime. Brought to trial, Derues maintained his mask of piety until the very last moment. Even on the scaffold, he offered performative prayers and final, hypocritical instructions to his wife regarding their children. After his execution, the public’s obsession with him culminated in a grim finality: the crowd, believing in the superstitious power of the remains of such a notorious man, fought over his charred bones, hoping they would bring luck in the lottery. His wife, who remained complicit in his deceptions, met her own end years later in the prison massacres, concluding the grim chronicle of the Derues family.

How It Unfolds

The early signs of sociopathy The narrative establishes Derues’s character through his childhood, highlighting a complete lack of empathy and an early penchant for theft. His response to physical punishment is not reform, but a chilling sense of superiority.

The mask of the invalid Derues adopts a persona of illness and religious submissiveness to manipulate those he targets. His appearance as a frail, coughing shopkeeper is a calculated performance designed to lower the defenses of his victims.

The trap is set By leveraging his reputation for "honesty" and "piety," Derues inserts himself into the lives of the Lamotte family. He uses the promise of financial and social advancement to draw them away from their estate and into his control.

The administrative murder The crime is not depicted as an explosion of passion, but as a systematic series of tasks. He kills his victims and then spends weeks manufacturing a paper trail of forged letters and deeds to maintain the illusion of their survival.

The unraveling of the lie As the husband’s suspicions grow, Derues attempts to turn the law against his victim by accusing her of dishonorable behavior. This final, desperate slander fails as the inconsistencies in his story become impossible to ignore.

The final performance The book concludes with his arrest, trial, and execution. Even while facing the scaffold, Derues clings to his facade, using his final moments to continue his charade of piety before a morbid and enthralled public.

The People

Antoine-François Derues is the central figure, a man defined by his "shameless cupidity" and "depraved cowardice." He is a chameleon who uses an affectation of religion to mask his predatory nature. Madame de Lamotte is his primary victim, a trusting woman who views Derues as a benefactor, blinded by his social performance. Her son, Edouard, represents the tragic innocence caught in Derues’s web, serving as a pawn in the murderer's elaborate schemes. Monsieur de Lamotte, the grieving husband, serves as the primary challenger to Derues's web of lies, representing the slow but inevitable pursuit of truth. Finally, characters like the widow Masson and the hawker provide a "marvellous instinct" of the public, representing the collective conscience that eventually identifies Derues as a monster before the legal system even confirms the evidence.

In Its Own Voice

Describing the early signs of the man’s character, the narrative notes:

His unconquerable taste for theft caused him to be expelled by the relations who had taken charge of him.

Reflecting on his lack of traditional criminal grandeur, the text notes:

There is nothing of that in Derues, not even a trace of courage; nothing but a shameless cupidity, exercising itself at first in the theft of a few pence filched from the poor.

Commenting on the public’s dark fascination following the execution:

On the morrow they bought up the fragments of bone, and hastened to buy lottery tickets, in the firm conviction that these precious relics would bring luck to the fortunate possessors!

What It's Really About

The book is a study of the banality of evil. It argues that the most dangerous criminals are not those who act with "heroic" defiance or audacity, but those who operate in the shadows, using the mundane tools of society—contracts, religion, and social reputation—to facilitate their crimes. It explores the tension between public perception and private reality, questioning how easily a performance of virtue can override the evidence of a man’s character. Ultimately, the book is concerned with the "logical development" of a criminal soul, showing how small acts of dishonesty, if unchecked, inevitably spiral into the most monstrous of deeds.

Why Read It Today

Readers who enjoy true crime and psychological character studies will find this book particularly compelling. It feels modern in its analysis of how a predator uses a "false heroism" or a mask of piety to deflect suspicion, a tactic that remains prevalent in contemporary accounts of con artists and serial offenders. The prose is precise and unsparing, providing a clear window into the social mechanics of the 18th century.

However, readers should be prepared for the book's stark, unflinching tone. It does not romanticize the criminal or seek to explain him away with modern psychological jargon; it describes his actions with a cold, journalistic detachment that can be quite jarring. The narrative reflects the period’s own biases regarding class and social standing, and its pacing is dictated by the methodical, almost bureaucratic nature of the crimes it recounts. It is not an easy read in terms of content, as it deals with the systematic murder of a woman and child, but for those interested in the history of crime and the enduring mystery of the human capacity for cruelty, the book offers a chilling, essential perspective. It remains in the mind as a reminder that the most "unclean" of criminals often hide in plain sight.