A powerful action thriller, Arsenal tells the intertwining stories of the Lindel brothers, Mikey and JP, who had only each other to rely on growing up. As adults, JP found success as the owner of a construction company, while Mikey became a small-time mobster, mired in a life of petty crime. When Mikey is kidnapped and held for a ransom by ruthless crime boss Eddie King, JP turns to the brothers' old pal Sal, a plain clothes detective for help. In order to rescue his brother, JP must risk everything and unleash his vengeance against King's relentless army of gangsters.