Murder on the legendary island of Ouessant: Dupin's 13th case in paperback! Breton sounds, enchanting sirens, and the breathtaking island of women: Bestselling author Jean-Luc Bannalec takes us on an atmospheric journey into the mystical world of Brittany with this gripping crime novel, confronting Inspector Dupin with the captivating mystery of a Celtic ritual. At the far edge of Brittany, amidst the primal forces of the Atlantic, lies the lush green island of Ouessant. Here, Inspector Dupin is tasked by the prefect to investigate a mysterious death: a Celtic musician has washed ashore. In his house, the police discover a clue linked to an ancient dark rite. However, the tight-knit community of this remote island complicates Dupin's investigation - sirens, priestesses, and storytellers live here outside the norms and know that the invisible is what truly matters. Dupin faces the nearly impossible task of uncovering what that could be.