Fifteen years after a tragic night on the banks of the Seine, Matthieu Verne has never truly moved on from the case that ruined his life. Élise Moreau has vanished. Her brother Étienne has disappeared into the darkness of doubt. And he has continued to live amidst files, silences and suspicions.When a major cyberattack strikes the French justice system's servers, the past returns with terrifying precision. Crucial evidence is under threat. Entire cases risk collapsing. And at the heart of the operation, an impossible demand: to stop the destruction, Matthieu must confess to Élise's murder.Accompanied by Nina Volkov, a brilliant yet abrasive cyber analyst, Matthieu traces a code that appears to bear the signature of a dead man. What begins as an IT crisis soon becomes a descent into the darkest recesses of memory: tampered archives, secret networks, compromised loyalties, political manipulation. At his side, Captain Belkacem gradually realises that this case goes far beyond mere digital blackmail.With Ghost, Hamon de Quillan crafts a sweeping and taut thriller, where time acts as a weapon and where every revelation reshapes the narrative. The investigation unfolds on several levels — personal, police, technological, institutional — without ever losing its emotional intensity. The novel explores guilt, survival, brotherhood and the price of truth in a world saturated with systems of control.Dark, elegant and taut, Ghost is aimed at readers of contemporary crime fiction, political thrillers and tech-driven suspense with a strong human dimension.