A battle-scarred War on Terror bounty hunter is forced to go to London on a manhunt for a disavowed CIA operative, which leads him into a deadly running battle with a former military comrade and his private army.

Police discover an elite fight club where they find seven underground levels, filled with the dead bodies of fighters from around the world. Only one man is found left alive. They have to work out if he’s a mass murderer atau the lone survivor?