What SAS Captain Trevor Stirling doesn't know may kill him--along with every man, woman, and child alive. His mission: follow a terrorist into the year A.D. 500 to stop a murder. If the fanatic succeeds in killing Artorious, later to be known as King Arthur, the Briton Lord of Battle and the most revered icon of British history, before his greatest military victory, the time-space continuum will fracture and the world will be destroyed....