After his fiancé dies of an overdose, a recovering addict (Jack Huston) embarks on a vengeful killing spree, hunting down the drug dealers before the town sheriff (Robert De Niro) puts an end to his vigilante justice.
Follows the life of Roberto Duran (Edgar Ramirez), the Panamanian fighter who made his professional debut in 1968 as a 16 year-old and retired in 2002 at the age of 50.