New York, the 1980s. Gary Pearl (Adam Driver), a former police officer, is ready to open a consulting agency for wealthy clients. He brings in his engineer brother, Irwin (Miles Teller), who is also determined to improve his social standing. From the outset, it's clear their new venture will lead the brothers onto slippery ground. The situation quickly turns dangerous, threatening their safety and that of their families, especially when they realize some of their potential clients are members of the Russian mafia, which is rapidly expanding its influence in the city.