Danger escalates as Michael Knight and Lex Devlin enter into the defense of a Puerto Rican jockey charged with felony murder as a result of a fixed race at Boston's Suffolk Downs.
As their investigation exposes the jockey's role, they become embroiled in a conflict between two Puerto Rican crime gangs. One of these gangs is aligned for the first time with Boston's Italian Mafia in tapping into almost limitless profits from the illicit trade of exotic and endangered species of wild animals captured in the Amazon rainforest of Brazil and smuggled through the shoreline of the Florida Keys. Working to free their client and to prevent the brutal abuse of these vulnerable animals, Michael and Lex find themselves squarely in the crossfire of rival organized crime gangs from the barrio of Jamaica Plain, Boston, to the gang-dominated streets of Mayaguez, Puerto Rico.