by Eric Fouassier · LGF/Le Livre de Poche · libro de bolsillo · ISBN 9782253249917
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A man's body is discovered at the Pantheon, outside the mausoleum of the illustrious mathematician Lagrange. A strange poem, which turns out to be a mathematical riddle, is pinned to his chest. Commander Gaspard Cloux of the criminal brigade is in charge of the investigation. Haunted by guilt since the death of his wife four years earlier, he struggles to regain his footing. This new case forces him to confront his pain as other bodies are found throughout Paris, always in the same macabre setting: a place related to the life of a famous mathematician and a riddle involving algebra or logic. Everything seems to invite Gaspard Cloux to follow the killer in a grim scavenger hunt, and it is an equation with several unknowns that he will have to solve.
