When Police kicks open the doors of the elite underground fight club Knuckledust, they find seven levels of hell, filled with the dead bodies of countless fighters, assassins and goons. Only one man, beaten up to a pulp, is still breathing: Hard Eight.

The show is about the Bannon family, who all have strong spy links. The parents, Dirk and Talia, were once arch enemy spies, but fell in love and got married. They now have three children who have all been brought up with spy techniques as a matter of course.