Haunted by a student’s disappearance, a biologist returns to her hometown near Brocéliande, a forest in Brittany steeped in legend, only to become the prime suspect when dark secrets awaken and history threatens to repeat itself…

Twenty years ago, Fanny Legoff was a suspect in her best friend Laura’s disappearance back home in Brocéliande. Laura’s body was never found. Since then, Fanny has rebuilt her life in Paris, where she is now a biologist. Until one day when Fanny receives a strange package containing a sword – covered in Laura’s blood. Who sent the package – and why? Unable to inform the police without incriminating herself, Fanny decides to return to Brocéliande and start her own investigation…

Broceliande blends crime drama with regional myth, using the legendary Breton forest as both setting and symbolic engine. Set in Brittany, the series draws its name from the mythical forest of Arthurian lore, long associated with Merlin, enchantment and hidden truths. That atmosphere of mystery permeates the show, grounding its modern investigations in a landscape shaped by centuries of legend.