Gregory Bonchamp, professor of history in a Parisian high school, exceeding receiving letters and invoices to the attention of his deceased father, Gregoire Bonchamp, decides to write to the administration to put an end to this situation. But he is far from suspecting that this simple mail will tip his life. While he has just been declared dead and stricken from all computer records in place of his father, how will he be able to prove his existence and regain his identity?