The Lost Coast Conspiracy — Robert Banks Hull

Trav helps his old Coast Guard buddy find a mysterious box that has been hidden away for nineteen years in a cave embedded in the cliffs along that very coast. This discovery places the unwitting Trav and Carol in the crosshairs of the notorious and ruthless Al Kemp, whose resources and cunning put any would-be adversaries at a decided disadvantage. Can Carol and Trav stop terrorists from using the contents of that mysterious box to exterminate the entire population of San Francisco? This dynamic duo saved the Golden Gate Bridge and Ingalls Shipyard from terrorist attacks, but this time it's more than the old battle of good and evil, its a race against Doomsday. Facing two deadly opponents, including the KGB and a unique, world-threatening weapon, Trav and Carol will not come away unscathed.