French army captain falsely convicted of treason in 1894 due to anti-Semitism. Exiled to Devil's Island, he is gradually exonerated through Picquart's efforts and eventually fully acquitted and reinstated years later.
Picquart previously instructed Dreyfus before leading the investigation.
Innocent man suffers while the true traitor remains free.
Henry's lies directly resulted in Dreyfus's wrongful sentencing.
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