What were the reasons John Clark gave in recommending the formation of a counter-terrorism unit?

Why does the American who hires the former KGB spy want him to instigate terrorist activity in Europe?

How does Terry Noonan's high-tech devise called a "Tri-Coder" locate people who are hiding at a scene?

Who leaked the identify of John Clark to John Brightling of Horizon Corporation placing John and his family is danger?

What makes Popov leave the Horizon complex and seek help from his former adversary John Clark?

Where and how does Horizon plan to launch the spread of the Shiva virus?

What is the punishment Brightling and his followers receive for their diabolical plans and actions?