When a British SAS officer is assassinated in Los Angeles by a member of an IRA splinter group, it is up to District Attorney Renée Marin to prosecute the killer. But before the proceedings can begin, Marin and Detectives Gibson and Donahue are confronted by a series of terrorist murders designed to force the release of the assassin. With the assistance of SAS Major Andrew Whitney, they find themselves caught up in a desperate race against time to unravel a series of betrayals and secret alliances that reach into the very highest levels of government.