A seemingly random murder alerts scientist Dan Clifford to a global conspiracy that stretches from the halls of Washington to the Honduran coast. Illegal, undersea activities have unwittingly uncovered a primordial secret that is wreaking havoc on aquatic life and the local human population. When the CDC and the full resources of a U.S. “threat interdiction” team fails to uncover the source of the devastation, Dan and a brilliant marine biologist, Rachel Sullivan, must race to unravel an unimaginable, ancient mystery in the murky depths. It's up to them to stop this terror before a determined multi-national corporation triggers a worldwide extinction event, the Seventh Sun of ancient myth.