Then Daniel is struck by a mysterious illness, diagnosed as radiation poisoning.  He is taken for treatment to a special laboratory in the jungles of Africa, supposedly to affect a cure.   There Sam finds an abandoned nuclear silo which is the image that has haunted him from his earliest memory.  He discovers the diabolical experiments performed there.  It becomes a race against unknown forces to save his son, to figure out what happened to his first son, and to uncover the clues about his own past.

The Children of Black Valley is a well written page turner.  It is extremely fast paced.  The action never lets up, from Sam's home to the depths of the African jungle.  The stresses and trauma which Sam and his wife suffer are very well portrayed.  The lengths taken by the unscrupulous men are frightening and must be curtailed.