“Blood Brother” unfolds in the gritty, deteriorating streets of a city where a newly freed ex-convict embarks on a deadly quest for vengeance against his childhood friends. He holds them responsible for allowing him to bear the brunt of a crime they all participated in. As the death toll rises, one of these friends, who has since become a police officer, is determined to halt the killing spree and rectify the numerous injustices of their violent history.