Tells the story of London being torn apart by the turbulent power struggles of its international gangs and the sudden power vacuum that's created when the head of London's most powerful crime family is assassinated.

When intelligence agent Kathryn Woodhouse is suspected of betraying the nation, her husband - also a legendary agent - faces the ultimate test of whether to be loyal to his marriage, or his country.

Rogue detective Nick O'Brien returns to hunt down a world-class thief, as the infamous Panther mafia plans its most ambitious diamond heist yet.