Escape from Darkness

A crystal discovered in the rapids of the Rio Alseseca in the depths of the Veracruz jungles leads to the development of a revolutionary engine by a young engineer. Oil-rich interests seek to destroy the prototype engine and to eliminate the young engineer.
Sherman Allen is hired to protect the invention and is caught in the crossfire. Sherman Allen fights to overcome a debilitating emotional depression by protecting the young engineer's life.
Sherman Allen, the engineer and a young waitress struggled to demonstrate to the United States government the value of the young engineer's invention and secure the government’s protection.
Their trail flows from the jungles of Veracruz through the Costa del Sol to a secret army test facility in the Anza-Borrego Desert along the United States Mexican border.