Primrose U.S.M.C‪.‬

When a freighter sinks with no apparent damage, and a nearby munitions-laden ship goes up in a fireball off the Oregon coast, General Easy designates Flossi Lighthouse to pull together Zach Primrose and the rest of the team to solve the puzzle. But before Flossi and the dive team can finish their investigation, another ship goes down off the coast of San Francisco under suspicious circumstances. It has been attacked from the bottom, but there is no evidence of any submarine presence.

What evil force is behind this? Is it General Kahn? Or is he merely a pawn in a worldwide terrorist plot? From the mountain roads of Costa Rica to the Panama Canal and up the west coast of Mexico and California, the team races against time to find out what mysterious force is sinking the ships before the next Navy carrier is wiped out.