Victim of a terrible plot, Captain Dreyfus was sentenced in December 1894 to deportation for high treason. His wife Lucie made a pact with him: to live, whatever the cost, while awaiting rehabilitation. During five years, the Dreyfus spouses exchanged hundreds of letters. They became a weapon of survival for Alfred. This film is the story of the correspondence of a man and a woman who unwittingly became the unsung heroes of the case that bears their name.