The most famous criminal case in Brittany continues to be surrounded by uncertainty. Did Guillaume Seznec actually murder his friend and associate Pierre Quéméneur? For years, various books have proposed new theories and hypotheses about the events that took place. The case, which has seen a fifteenth request for a retrial filed on September 7, 2026, remains far from being resolved. The case has captured public interest for decades, with legal proceedings and media coverage often reigniting debates about the evidence and the fairness of the trial. The lack of conclusive proof has led to speculation and controversy, with some believing that Seznec was wrongly convicted and others maintaining that he was indeed guilty. Legal experts and historians have long debated the case, pointing to inconsistencies in the evidence and the possibility of witness misstatements. The ongoing calls for a retrial highlight the enduring questions surrounding the events of that time and the need for further examination of the case. Despite the passage of time, the case remains a significant part of Brittany's legal and cultural history. It continues to be referenced in discussions about justice, the reliability of forensic evidence, and the complexities of criminal trials. The unresolved nature of the case ensures that it remains a topic of interest for researchers and the public alike.