Scarecrow by Matthew Reilly

It is the greatest bounty hunt in history. There are 15 targets, 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 on the target list, one stands out. An enigmatic Marine named Shane Schofield, call-sign: SCARECROW. And so Schofield is plunged into a headlong race around the world, pursued by a fearsome collection of international bounty hunters--including the 'Black Knight', a notoriously ruthless hunter who seems intent on eliminating only Schofield. The race is on and the pace is frantic as Schofield 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. He led his men into hell in Ice Station. He protected the President against all odds in Area 7. This time it's different, because this time Scarecrow is the target.