The true identity of the secret informant remained a mystery and source of much public curiosity and speculation for more than 30 years. That is until, in 2005, special agent Mark Felt shockingly revealed himself as the tipster. This unbelievable true story chronicles the personal and professional life of the brilliant and uncompromising Felt, who risked and ultimately sacrificed everything - his family, his career, his freedom - in the name of justice.