Ed Ramsey's girlfriend, Tracey, and his son, Frosty, just completed the training necessary to scuba dive. As a celebration, Ed invited them to join him on a weekend dive trip in the Gulf of Mexico, only to have it marred by tragedy: a diver goes missing and later is found dead on the sea bottom. However, what first appears to be a fatal accident turns out to be a case of murder, and Ed reluctantly finds himself entangled in the investigation. ...