THE NEW LUKE CARLTON THRILLER.BBC Security Correspondent FRANK GARDNER'S thrillers are . . .'Fast, taut, tense, accurate.' FREDERICK FORSYTH'Utterly authentic.' DAILY MAIL'Enthralling, intelligent.' FINANCIAL TIMES 'Nerve-shredding.' TONY PARSONS'Heart-in-mouth.' i-NEWSPAPER'Compulsively readable.' RADIO TIMES __________________________________________The world is on high alert. Across the Strait