Everyone has a secret. Twins Sarah and Gaëlle near 25; for ten years, Sarah has been a fundamentalist Carmelite in a Brazilian convent, and Gaëlle has been in prison for a heinous crime. Sarah comes to the attention of Fr. Joachim, a priest and physician; he can find no cause for her debilitating abdominal pain. When Sarah and he are transferred to Paris, Joachim looks for Gaëlle, now on probation and finding no respite from society's approbation. An enterprising reporter is digging into Gaëlle's life, the mother superior of Sarah's convent hovers over her, and Joachim investigates the phenomenon of twin's symmetry. Is there any release from the past?

The amazing true story of Frédéric Bourdin, who after having plundered all the centers for runaway minors and deliquents in Europe, even thought he has come of age, now passes himself off as Nicholas Barclay, a 13-year-old American who had vanished three years ago. To his astonishment, Nicholas's family welcomes him like their son, leaving Interpol and the FBI aghast. It is the beginning of a race against time for the investigators, family and Bourdin. But who is manipulating whom? And who is Frederic Bourdin in reality?