Big Nick is back on the hunt in Europe and closing in on Donnie, who is embroiled in the treacherous and unpredictable world of diamond thieves and the infamous Panther mafia, as they plot a massive heist of the world's largest diamond exchange.

In 1950s Kansas City, Missouri, two criminal syndicates have struck an uneasy peace. One Italian, one African-American. Together they control an alternate economy — that of exploitation, graft and drugs. To cement their peace, the heads of both families have traded their youngest sons. This too is the history of America.