book cover of Deadly Underworld
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Deadly Underworld

(2026)
(The second book in the French Mystery series)
A novel by

 
 
In their second case together, Capitaine Armand de Varenne and Lieutenant Margaux David find themselves in the gloomy underworld of Paris: the catacombs and the labyrinthine network of former quarries.

The body of a municipal surveyor and avid caver is discovered near the catacombs. Armand and Margaux take charge of the investigation. What was described to them as a routine case turns out to be a complex murder inquiry, leading them into the drug scene as well as the victim’s unusual private life.



Genre: Mystery



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