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The body of Maude Gaillard, 52, a well-liked psychologist, is found dead in the grounds of a luxury hotel. Suspicion quickly falls on Ida Malapeyre, an unstable patient under judicial supervision whose connection to the victim may be more complex than it appears... As Cassandre's team investigates this lead, the investigation takes an unexpected turn: Cassandre is kidnapped! To save her and uncover the truth, the team must unravel a past that some were willing to kill to erase.

Annecy. When Valentin Poncet, an exemplary firefighter with a remarkable past, is found dead in suspicious circumstances, Commissioner Cassandre and her team must untangle the threads of a murder that appears to be linked to a burglary. Between the discovery of a mysterious fiancée Val may have had, the shadow of a dangerous arsonist looming overhead, and tensions within the fire station—still reeling from this second recent tragedy—each clue raises new questions and sheds light on a tragic family history with deeply buried secrets.