A tech billionaire discovers a zero-sum energy device from wreckage located at the bottom of the world's deepest oceanic trench … Deeper than Mount Everest is tall. The United States Navy sends for Mallory Capehart, their best salvage officer... Commander Mallory Capehart USN. She is haunted by memories of a past disaster that killed everyone on her dive team and suffers from acute PTSD. Her mission? To raise and recover the wreck of a legendary vessel. Mallory accepts the top-secret assignment to do the impossible and no one knows whether she'll succeed. Adding to her problems are the Chinese and Russians who also want the zero-sum energy device. And Mallory isn't quite sure who's side some of her teammates are on.