Modern treasure hunters, a dead professor, and a mysterious club. In Banyuls-sur-Mer, at the southwestern tip of France, a fine layer of snow covers the usually sun-drenched beach. Perez, a hobby investigator and small-time crook, is struggling to cope with the unusual weather conditions when his friend Mata, a diver at the Marine Biological Institute of Côte Vermeille, disappears without a trace. Shortly thereafter, a dead professor is found in a pool, and heavily armed boats are patrolling the Mediterranean between France and Spain in search of a mysterious wreck. Together with his stepdaughter and son-in-law, Perez sets out to find Mata and becomes embroiled in a fast-paced and complex case that raises more and more questions. What investigations did the professor conduct? What is the story behind the notorious and enigmatic club?.