Scarecrow — Matthew Reilly

It is the greatest bounty hunt in history. The targets are the finest warriors in the world-commandos, spies, terrorists. And they must all be dead by 12 noon, today. The price on their heads: almost $20 million each.
Among the names, one stands out. The enigmatic Marine, Shane Schofield, who goes by the call-sign "Scarecrow." Schofield is plunged into a race around the world, pursued by a fearsome collection of international bounty hunters. The race is on and the pace is frantic as he fights for survival, in the process unveiling a vast international conspiracy and the terrible reason why he cannot, under any circumstances, be allowed to live!