Cat's claw - John Whitman

The world's most powerful leaders are gathering in Los Angeles for the G-8 summit, unaware that they have been targeted by two separate terrorist groups, each with its own lethal agenda. Uncovering and disarming one bomb would be difficult enough; eliminating both will be nearly impossible.
On the trail of a ruthless assassin, rogue CTU agent Jack Bauer doesn't know that another conspiracy is brewing around him -- a poisonous plot to violently dictate the future of the free world. If Bauer does nothing, in twenty-four hours the entire planet may be plunged into chaos, its primary heads of state ruthlessly destroyed. But if he acts, his daughter Kim will die instead.