In 1982, André Bamberski receives the devastating news that his 14-year-old daughter, Kalinka, has died while on holiday in Germany with her mother and stepfather. Suspecting that her death was not accidental, Bamberski embarks on a quest for the truth. His suspicions are heightened by a flawed autopsy report, prompting him to accuse Kalinka’s stepfather, Dr. Dieter Krombach, of murder. When German authorities fail to prosecute Krombach, Bamberski seeks to bring the case to France, dedicating his life to securing justice for Kalinka and ensuring Krombach’s imprisonment.